Trigonometry (11th Edition)
Trigonometry (11th Edition)
11th Edition
ISBN: 9780134217437
Author: Margaret L. Lial, John Hornsby, David I. Schneider, Callie Daniels
Publisher: PEARSON
bartleby

Concept explainers

Trigonometric Identities
Trigonometry in mathematics deals with the right-angled triangle’s angles and sides. By trigonometric identities, we mean the identities we use whenever we need to express the various trigonometric functions in terms of an equation.
Inverse Trigonometric Functions
Inverse trigonometric functions are the inverse of normal trigonometric functions. Alternatively denoted as cyclometric or arcus functions, these inverse trigonometric functions exist to counter the basic trigonometric functions, such as sine (sin), cosi…
bartleby

Videos

Textbook Question
Book Icon
Chapter 6.1, Problem 57E

Use a calculator to approximate each value in decimal degrees. See Example 4.

θ = tan–1(–7.7828641)

Expert Solution & Answer
Check Mark

Want to see the full answer?

Check out a sample textbook solution
Blurred answer
Previous
Chapter 6.1, Problem 56E
Next
Chapter 6.1, Problem 58E
Students have asked these similar questions
Question 9 1 5 4 3 2 1 -8 -7 -05 -4 -3 -2 1 1 2 3 4 5 6 7 8 -1 7 -2 -3 -4 -5+ 1-6+ For the graph above, find the function of the form -tan(bx) + c f(x) =
Question 8 5 4 3 2 1 -8 -7 -6 -5/-4 -3 -2 -1, 1 2 3 4 5 6 7/8 -1 -2 -3 -4 -5 0/1 pt 3 98 C -6 For the graph above, find the function of the form f(x)=a tan(bx) where a=-1 or +1 only f(x) = = Question Help: Video Submit Question Jump to Answer
6+ 5 -8-7-0-5/-4 -3 -2 -1, 4 3+ 2- 1 1 2 3/4 5 6 7.18 -1 -2 -3 -4 -5 -6+ For the graph above, find the function of the form f(x)=a tan(bx) where a=-1 or +1 only f(x) =

Chapter 6 Solutions

Trigonometry (11th Edition)

Ch. 6.1 - CONCEPT PREVIEW Fill in the blank(s) to...Ch. 6.1 - CONCEPT PREVIEW Fill in the blank(s) to...Ch. 6.1 - 3. y = cos–1 x means that x = ________ for 0 ≤ y...Ch. 6.1 - 4. The point lies on the graph of y = tan x....Ch. 6.1 - 5. If a function f has an inverse and f(π) = –1,...Ch. 6.1 - CONCEPT PREVIEW Fill in the blank(s) to...Ch. 6.1 - CONCEPT PREVIEW Write a short answer for each of...Ch. 6.1 - Consider the inverse cosine function y = cos1 x,...Ch. 6.1 - 9. Consider the inverse tangent function y =...Ch. 6.1 - 10. Give the domain and range of each inverse...
Ch. 6.1 - 11. Concept Check Why are different intervals...Ch. 6.1 - Concept Check For positive values of a, cot1 a is...Ch. 6.1 - Find the exact value of each real number y if it...Ch. 6.1 - Find the exact value of each real number y if it...Ch. 6.1 - Find the exact value of each real number y if...Ch. 6.1 - Find the exact value of each real number y if it...Ch. 6.1 - Find the exact value of each real number y if it...Ch. 6.1 - Find the exact value of each real number y if it...Ch. 6.1 - Find the exact value of each real number y if it...Ch. 6.1 - Find the exact value of each real number y if it...Ch. 6.1 - Find the exact value of each real number y if it...Ch. 6.1 - Find the exact value of each real number y if it...Ch. 6.1 - Find the exact value of each real number y if it...Ch. 6.1 - Find the exact value of each real number y if it...Ch. 6.1 - Find the exact value of each real number y if it...Ch. 6.1 - Find the exact value of each real number y if it...Ch. 6.1 - Find the exact value of each real number y if it...Ch. 6.1 - Find the exact value of each real number y if it...Ch. 6.1 - Find the exact value of each real number y if it...Ch. 6.1 - Find the exact value of each real number y if it...Ch. 6.1 - Find the exact value of each real number y if it...Ch. 6.1 - Find the exact value of each real number y if...Ch. 6.1 - Find the exact value of each real number y if it...Ch. 6.1 - Find the exact value of each real number y if it...Ch. 6.1 - Find the exact value of each real number y if it...Ch. 6.1 - Find the exact value of each real number y if it...Ch. 6.1 - Give the degree measure of if it exists. Do not...Ch. 6.1 - Give the degree measure of if it exists. Do not...Ch. 6.1 - Give the degree measure of if it exists. Do not...Ch. 6.1 - Give the degree measure of θ if it exists. Do...Ch. 6.1 - Give the degree measure of if it exists. Do not...Ch. 6.1 - Give the degree measure of if it exists. Do not...Ch. 6.1 - Give the degree measure of if it exists. Do not...Ch. 6.1 - Give the degree measure of if it exists. Do not...Ch. 6.1 - Give the degree measure of θ if it exists. Do...Ch. 6.1 - Give the degree measure of if it exists. Do not...Ch. 6.1 - Give the degree measure of if it exists. Do not...Ch. 6.1 - Give the degree measure of if it exists. Do not...Ch. 6.1 - Use a calculator to approximate each value in...Ch. 6.1 - Use a calculator to approximate each value in...Ch. 6.1 - Use a calculator to approximate each value in...Ch. 6.1 - Use a calculator to approximate each real number...Ch. 6.1 - Use a calculator to approximate each value in...Ch. 6.1 - Use a calculator to approximate each value in...Ch. 6.1 - Use a calculator to approximate each value in...Ch. 6.1 - Use a calculator to approximate each value in...Ch. 6.1 - Use a calculator to approximate each value in...Ch. 6.1 - Use a calculator to approximate each value in...Ch. 6.1 - Use a calculator to approximate each real number...Ch. 6.1 - Use a calculator to approximate each real number...Ch. 6.1 - Use a calculator to approximate each real number...Ch. 6.1 - Use a calculator to approximate each real number...Ch. 6.1 - Use a calculator to approximate each real number...Ch. 6.1 - Use a calculator to approximate each real number...Ch. 6.1 - Use a calculator to approximate each real number...Ch. 6.1 - Use a calculator to approximate each real number...Ch. 6.1 - Use a calculator to approximate each real number...Ch. 6.1 - Use a calculator to approximate each real number...Ch. 6.1 - Prob. 69ECh. 6.1 - Prob. 70ECh. 6.1 - Prob. 71ECh. 6.1 - Prob. 72ECh. 6.1 - Prob. 73ECh. 6.1 - Prob. 74ECh. 6.1 - Evaluate each expression without using a...Ch. 6.1 - Evaluate each expression without using a...Ch. 6.1 - Evaluate each expression without using a...Ch. 6.1 - Evaluate each expression without using a...Ch. 6.1 - Evaluate each expression without using a...Ch. 6.1 - Evaluate each expression without using a...Ch. 6.1 - Evaluate each expression without using a...Ch. 6.1 - Evaluate each expression without using a...Ch. 6.1 - Evaluate each expression without using a...Ch. 6.1 - Evaluate each expression without using a...Ch. 6.1 - Prob. 85ECh. 6.1 - Prob. 86ECh. 6.1 - Evaluate each expression without using a...Ch. 6.1 - Evaluate each expression without using a...Ch. 6.1 - Evaluate each expression without using a...Ch. 6.1 - Evaluate each expression without using a...Ch. 6.1 - Use a calculator to find each value. Give answers...Ch. 6.1 - Prob. 92ECh. 6.1 - Prob. 93ECh. 6.1 - Use a calculator to find each value. Give...Ch. 6.1 - Write each trigonometric expression as an...Ch. 6.1 - Write each trigonometric expression as an...Ch. 6.1 - Write each trigonometric expression as an...Ch. 6.1 - Write each trigonometric expression as an...Ch. 6.1 - Write each trigonometric expression as an...Ch. 6.1 - Prob. 100ECh. 6.1 - Write each trigonometric expression as an...Ch. 6.1 - Prob. 102ECh. 6.1 - Write each trigonometric expression as an...Ch. 6.1 - Prob. 104ECh. 6.1 - 105. Angle of Elevation of a Shot Put Refer to...Ch. 6.1 - Prob. 106ECh. 6.1 - Observation of a Painting A painting 1 m high and...Ch. 6.1 - Landscaping Formula A shrub is planted in a...Ch. 6.1 - Communications Satellite Coverage The figure shows...Ch. 6.1 - Prob. 110ECh. 6.1 - Prob. 111ECh. 6.1 - Prob. 112ECh. 6.1 - Prob. 113ECh. 6.1 - Prob. 114ECh. 6.2 - CONCEPT PREVIEW Use the unit circle shown here...Ch. 6.2 - CONCEPT PREVIEW Use the unit circle shown here to...Ch. 6.2 - CONCEPT PREVIEW Use the unit circle shown here...Ch. 6.2 - CONCEPT PREVIEW Use the unit circle shown here to...Ch. 6.2 - CONCEPT PREVIEW Use the unit circle shown here...Ch. 6.2 - CONCEPT PREVIEW Use the unit circle shown here...Ch. 6.2 - CONCEPT PREVIEW Use the unit circle shown here to...Ch. 6.2 - CONCEPT PREVIEW Use the unit circle shown here to...Ch. 6.2 - CONCEPT PREVIEW Use the unit circle shown here to...Ch. 6.2 - CONCEPT PREVIEW Use the unit circle shown here to...Ch. 6.2 - CONCEPT PREVIEW Use the unit circle shown here to...Ch. 6.2 - CONCEPT PREVIEW Use the unit circle shown here...Ch. 6.2 - Concept Check Suppose that in solving an equation...Ch. 6.2 - 14. Concept Check Lindsay solved the equation...Ch. 6.2 - Solve each equation for exact solutions over the...Ch. 6.2 - Solve each equation for exact solutions over the...Ch. 6.2 - Solve each equation for exact solutions over the...Ch. 6.2 - Solve each equation for exact solutions over the...Ch. 6.2 - Solve each equation for exact solutions over the...Ch. 6.2 - Solve each equation for exact solutions over the...Ch. 6.2 - Solve each equation for exact solutions over the...Ch. 6.2 - Solve each equation for exact solutions over the...Ch. 6.2 - Solve each equation for exact solutions over the...Ch. 6.2 - Solve each equation for exact solutions over the...Ch. 6.2 - 2 sin2 x = 3 sin x + 1Ch. 6.2 - Solve each equation for exact solutions over the...Ch. 6.2 - Solve each equation for solutions over the...Ch. 6.2 - Solve each equation for solutions over the...Ch. 6.2 - Solve each equation for solutions over the...Ch. 6.2 - Solve each equation for solutions over the...Ch. 6.2 - Solve each equation for solutions over the...Ch. 6.2 - Solve each equation for solutions over the...Ch. 6.2 - Solve each equation for solutions over the...Ch. 6.2 - Prob. 34ECh. 6.2 - Solve each equation for solutions over the...Ch. 6.2 - Solve each equation for solutions over the...Ch. 6.2 - Solve each equation for solutions over the...Ch. 6.2 - Solve each equation for solutions over the...Ch. 6.2 - Solve each equation for solutions over the...Ch. 6.2 - Solve each equation for solutions over the...Ch. 6.2 - Solve each equation for solutions over the...Ch. 6.2 - Prob. 42ECh. 6.2 - Solve each equation for solutions over the...Ch. 6.2 - Prob. 44ECh. 6.2 - Solve each equation for solutions over the...Ch. 6.2 - Solve each equation for solutions over the...Ch. 6.2 - Solve each equation (x in radians and in degrees)...Ch. 6.2 - Prob. 48ECh. 6.2 - Solve each equation (x in radians and in degrees)...Ch. 6.2 - Prob. 50ECh. 6.2 - Solve each equation (x in radians and θ in...Ch. 6.2 - Solve each equation (x in radians and in degrees)...Ch. 6.2 - Solve each equation (x in radians and in degrees)...Ch. 6.2 - Prob. 54ECh. 6.2 - Solve each equation (x in radians and θ in...Ch. 6.2 - Solve each equation (x in radians and θ in...Ch. 6.2 - Solve each equation (x in radians and in degrees)...Ch. 6.2 - Prob. 58ECh. 6.2 - Solve each equation (x in radians and in degrees)...Ch. 6.2 - Prob. 60ECh. 6.2 - Solve each equation (x in radians and in degrees)...Ch. 6.2 - Prob. 62ECh. 6.2 - Prob. 63ECh. 6.2 - The following equations cannot be solved by...Ch. 6.2 - Pressure on the Eardrum See Example 6. No musical...Ch. 6.2 - Accident Reconstruction To reconstruct accidents...Ch. 6.2 - Prob. 67ECh. 6.2 - Prob. 68ECh. 6.3 - CONCEPT PREVIEW Refer to Exercises 1–6 in the...Ch. 6.3 - CONCEPT PREVIEW Refer to Exercises 16 in the...Ch. 6.3 - CONCEPT PREVIEW Refer to Exercises 1–6 in the...Ch. 6.3 - CONCEPT PREVIEW Refer to Exercises 16 in the...Ch. 6.3 - CONCEPT PREVIEW Refer to Exercises 16 in the...Ch. 6.3 - CONCEPT PREVIEW Refer to Exercises 1-6 in the...Ch. 6.3 - CONCEPT PREVIEW Refer to Exercises 712 in the...Ch. 6.3 - CONCEPT PREVIEW Refer to Exercises 712 in the...Ch. 6.3 - CONCEPT PREVIEW Refer to Exercises 712 in the...Ch. 6.3 - CONCEPT PREVIEW Refer to Exercises 712 in the...Ch. 6.3 - CONCEPT PREVIEW Refer to Exercises 7–12 in the...Ch. 6.3 - CONCEPT PREVIEW Refer to Exercises 712 in the...Ch. 6.3 - Suppose solving a trigonometric equation for...Ch. 6.3 - 14. Suppose solving a trigonometric equation for...Ch. 6.3 - 15. Suppose solving a trigonometric equation for...Ch. 6.3 - Prob. 16ECh. 6.3 - Solve each equation in x for exact solutions...Ch. 6.3 - Solve each equation in x for exact solutions...Ch. 6.3 - Solve each equation in x for exact solutions...Ch. 6.3 - Solve each equation in x for exact solutions over...Ch. 6.3 - Solve each equation in x for exact solutions...Ch. 6.3 - Solve each equation in x for exact solutions over...Ch. 6.3 - Solve each equation in x for exact solutions...Ch. 6.3 - Solve each equation in x for exact solutions over...Ch. 6.3 - Solve each equation in x for exact solutions...Ch. 6.3 - Solve each equation in x for exact solutions...Ch. 6.3 - Solve each equation in x for exact solutions...Ch. 6.3 - Solve each equation in x for exact solutions...Ch. 6.3 - Prob. 29ECh. 6.3 - Solve each equation in x for exact solutions over...Ch. 6.3 - Solve each equation in x for exact solutions over...Ch. 6.3 - Solve each equation in x for exact solutions...Ch. 6.3 - Solve each equation in x for exact solutions over...Ch. 6.3 - Solve each equation in x for exact solutions over...Ch. 6.3 - Solve each equation (x in radians and in degrees)...Ch. 6.3 - Solve each equation (x in radians and in degrees)...Ch. 6.3 - Solve each equation (x in radians and in degrees)...Ch. 6.3 - Solve each equation (x in radians and in degrees)...Ch. 6.3 - Solve each equation (x in radians and θ in...Ch. 6.3 - Prob. 40ECh. 6.3 - Solve each equation (x in radians and θ in...Ch. 6.3 - Prob. 42ECh. 6.3 - Solve each equation (x in radians and in degrees)...Ch. 6.3 - Prob. 44ECh. 6.3 - Solve each equation (x in radians and in degrees)...Ch. 6.3 - Solve each equation (x in radians and in degrees)...Ch. 6.3 - Solve each equation (x in radians and in degrees)...Ch. 6.3 - Solve each equation (x in radians and in degrees)...Ch. 6.3 - Solve each equation (x in radians and θ in...Ch. 6.3 - Solve each equation (x in radians and θ in...Ch. 6.3 - Solve each equation for solutions over the...Ch. 6.3 - Solve each equation for solutions over the...Ch. 6.3 - Solve each equation for solutions over the...Ch. 6.3 - Solve each equation for solutions over the...Ch. 6.3 - The following equations cannot be solved by...Ch. 6.3 - The following equations cannot be solved by...Ch. 6.3 - 57. Pressure of a Plucked String If a string with...Ch. 6.3 - Hearing Beats in Music Musicians sometimes tune...Ch. 6.3 - 59. Hearing Difference Tones When a musical...Ch. 6.3 - Daylight Hours in New Orleans The seasonal...Ch. 6.3 - Average Monthly Temperature in Vancouver The...Ch. 6.3 - Average Monthly Temperature in Phoenix The...Ch. 6.3 - (Modeling) Alternating Electric Current The study...Ch. 6.3 - Prob. 64ECh. 6.3 - (Modeling) Alternating Electric Current The...Ch. 6.3 - Prob. 66ECh. 6.3 - Graph y = cos1 x, and indicate the coordinates of...Ch. 6.3 - Prob. 2QCh. 6.3 - Prob. 3QCh. 6.3 - Evaluate each expression without using a...Ch. 6.3 - Prob. 5QCh. 6.3 - Prob. 6QCh. 6.3 - Prob. 7QCh. 6.3 - Solve each equation for solutions over the...Ch. 6.3 - Prob. 9QCh. 6.3 - Solve each equation for solutions over the...Ch. 6.4 - Which one of the following equations has solution...Ch. 6.4 - 2. Which one of the following equations has...Ch. 6.4 - Prob. 3ECh. 6.4 - Which one of the following equations has solution...Ch. 6.4 - 5. Which one of the following equations has...Ch. 6.4 - 4. Which one of the following equations has...Ch. 6.4 - Solve each equation for x, where x is restricted...Ch. 6.4 - Prob. 8ECh. 6.4 - Solve each equation for x, where x is restricted...Ch. 6.4 - Prob. 10ECh. 6.4 - Solve each equation for x, where x is restricted...Ch. 6.4 - Prob. 12ECh. 6.4 - Solve each equation for x, where x is restricted...Ch. 6.4 - Prob. 14ECh. 6.4 - Solve each equation for x, where x is restricted...Ch. 6.4 - Solve each equation for x, where x is restricted...Ch. 6.4 - Solve each equation for x, where x is restricted...Ch. 6.4 - Solve each equation for x, where x is restricted...Ch. 6.4 - Prob. 19ECh. 6.4 - Prob. 20ECh. 6.4 - Solve each equation for x, where x is restricted...Ch. 6.4 - Prob. 22ECh. 6.4 - Prob. 23ECh. 6.4 - Prob. 24ECh. 6.4 - Refer to Exercise 15. A student solving this...Ch. 6.4 - Prob. 26ECh. 6.4 - Solve each equation for exact solutions. See...Ch. 6.4 - Solve each equation for exact solutions. See...Ch. 6.4 - Solve each equation for exact solutions. See...Ch. 6.4 - Prob. 30ECh. 6.4 - Solve each equation for exact solutions. See...Ch. 6.4 - Solve each equation for exact solutions. See...Ch. 6.4 - Solve each equation for exact solutions. See...Ch. 6.4 - Solve each equation for exact solutions. See...Ch. 6.4 - Solve each equation for exact solutions. See...Ch. 6.4 - Solve each equation for exact solutions. See...Ch. 6.4 - Solve each equation for exact solutions. See...Ch. 6.4 - Solve each equation for exact solutions. See...Ch. 6.4 - Solve each equation for exact solutions. See...Ch. 6.4 - Prob. 40ECh. 6.4 - Solve each equation for exact solutions. See...Ch. 6.4 - Solve each equation for exact solutions. See...Ch. 6.4 - Solve each equation for exact solutions. See...Ch. 6.4 - Prob. 44ECh. 6.4 - Prob. 45ECh. 6.4 - Prob. 46ECh. 6.4 - Prob. 47ECh. 6.4 - Prob. 48ECh. 6.4 - Prob. 49ECh. 6.4 - Prob. 50ECh. 6.4 - 51. Depth of Field When a large-view camera is...Ch. 6.4 - Prob. 52ECh. 6.4 - Prob. 53ECh. 6.4 - 54. Viewing Angle of an Observer While visiting a...Ch. 6.4 - Prob. 55ECh. 6 - Prob. 1RECh. 6 - The ranges of the inverse tangent and inverse...Ch. 6 - Concept Check Determine whether each statement...Ch. 6 - Concept Check Determine whether each statement...Ch. 6 - Prob. 5RECh. 6 - Find the exact value of each real number y. Do not...Ch. 6 - Prob. 7RECh. 6 - Prob. 8RECh. 6 - Prob. 9RECh. 6 - Prob. 10RECh. 6 - Find the exact value of each real number y. Do not...Ch. 6 - Prob. 12RECh. 6 - Prob. 13RECh. 6 - Prob. 14RECh. 6 - Prob. 15RECh. 6 - Give the degree measure of . Do not use a...Ch. 6 - Prob. 17RECh. 6 - Prob. 18RECh. 6 - Prob. 19RECh. 6 - Prob. 20RECh. 6 - Prob. 21RECh. 6 - Prob. 22RECh. 6 - Evaluate each expression without using a...Ch. 6 - Prob. 24RECh. 6 - Prob. 25RECh. 6 - Prob. 26RECh. 6 - Prob. 27RECh. 6 - Prob. 28RECh. 6 - Evaluate each expression without using a...Ch. 6 - Evaluate each expression without using a...Ch. 6 - Prob. 31RECh. 6 - Prob. 32RECh. 6 - Evaluate each expression without using a...Ch. 6 - Prob. 34RECh. 6 - Prob. 35RECh. 6 - Prob. 36RECh. 6 - Prob. 37RECh. 6 - Prob. 38RECh. 6 - Prob. 39RECh. 6 - Prob. 40RECh. 6 - Prob. 41RECh. 6 - Prob. 42RECh. 6 - Prob. 43RECh. 6 - Prob. 44RECh. 6 - Prob. 45RECh. 6 - Solve each equation for exact solutions over the...Ch. 6 - Prob. 47RECh. 6 - Prob. 48RECh. 6 - Prob. 49RECh. 6 - Prob. 50RECh. 6 - Prob. 51RECh. 6 - Prob. 52RECh. 6 - Prob. 53RECh. 6 - Prob. 54RECh. 6 - Prob. 55RECh. 6 - Prob. 56RECh. 6 - Prob. 57RECh. 6 - Prob. 58RECh. 6 - Prob. 59RECh. 6 - Prob. 60RECh. 6 - Prob. 61RECh. 6 - Prob. 62RECh. 6 - Prob. 63RECh. 6 - Prob. 64RECh. 6 - Prob. 65RECh. 6 - Prob. 66RECh. 6 - 1. Graph y = sin–1 x, and indicate the...Ch. 6 - Find the exact value of each real number y. Do not...Ch. 6 - Give the degree measure of . Do not use a...Ch. 6 - 4. Use a calculator to approximate each value in...Ch. 6 - Evaluate each expression without using a...Ch. 6 - 6. Explain why sin–1 3 is not defined. Ch. 6 - Prob. 7TCh. 6 - Write tan(arcsin u) as an algebraic expression in...Ch. 6 - Prob. 9TCh. 6 - Prob. 10TCh. 6 - Prob. 11TCh. 6 - Prob. 12TCh. 6 - Prob. 13TCh. 6 - Prob. 14TCh. 6 - Prob. 15TCh. 6 - Prob. 16TCh. 6 - Prob. 17TCh. 6 - Prob. 18TCh. 6 - Prob. 19TCh. 6 - Prob. 20T
Knowledge Booster
Background pattern image
Trigonometry
Learn more about
Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, trigonometry and related others by exploring similar questions and additional content below.
Similar questions
SEE MORE QUESTIONS
Recommended textbooks for you
Text book image
Algebra & Trigonometry with Analytic Geometry
Algebra
ISBN:9781133382119
Author:Swokowski
Publisher:Cengage
Text book image
Holt Mcdougal Larson Pre-algebra: Student Edition...
Algebra
ISBN:9780547587776
Author:HOLT MCDOUGAL
Publisher:HOLT MCDOUGAL
Text book image
Trigonometry (MindTap Course List)
Trigonometry
ISBN:9781305652224
Author:Charles P. McKeague, Mark D. Turner
Publisher:Cengage Learning
Text book image
Mathematics For Machine Technology
Advanced Math
ISBN:9781337798310
Author:Peterson, John.
Publisher:Cengage Learning,
SEE MORE TEXTBOOKS
Inverse Trigonometric Functions; Author: Professor Dave Explains;https://www.youtube.com/watch?v=YXWKpgmLgHk;License: Standard YouTube License, CC-BY