I still need to know how we get from sin(.909)=.788=65

Trigonometry (11th Edition)
11th Edition
ISBN:9780134217437
Author:Margaret L. Lial, John Hornsby, David I. Schneider, Callie Daniels
Publisher:Margaret L. Lial, John Hornsby, David I. Schneider, Callie Daniels
Chapter1: Trigonometric Functions
Section: Chapter Questions
Problem 1RE: 1. Give the measures of the complement and the supplement of an angle measuring 35°.
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I still need to know how we get from sin(.909)=.788=65?

### Step 2

Here, consider:

\[ y = 0.9090 \]
\[ y = \sin(x) \]
\[ \sin^{-1} (0.9090) = x \]

Substituting the value in the above equation then,

\[ \text{arc} \sin(y) = \sin^{-1} (0.9090) = x + 2k\pi \]
\[ = 65.36^\circ + 2 \times \pm1 \times 180^\circ \]
\[ = 65.36^\circ \pm 360^\circ \]

Taking the negative sign for clockwise and positive for anticlockwise then,

If the angle moves anticlockwise, then \( 360^\circ \) is considered as \( 0^\circ \).

Hence, two values of \(\text{arc} \sin(0.9090)\) are \(-294.63^\circ, 65.36^\circ\).

The angle is measured as anticlockwise; hence the value of \(\text{arc} \sin(0.9090)\) is \(65.36^\circ\).
Transcribed Image Text:### Step 2 Here, consider: \[ y = 0.9090 \] \[ y = \sin(x) \] \[ \sin^{-1} (0.9090) = x \] Substituting the value in the above equation then, \[ \text{arc} \sin(y) = \sin^{-1} (0.9090) = x + 2k\pi \] \[ = 65.36^\circ + 2 \times \pm1 \times 180^\circ \] \[ = 65.36^\circ \pm 360^\circ \] Taking the negative sign for clockwise and positive for anticlockwise then, If the angle moves anticlockwise, then \( 360^\circ \) is considered as \( 0^\circ \). Hence, two values of \(\text{arc} \sin(0.9090)\) are \(-294.63^\circ, 65.36^\circ\). The angle is measured as anticlockwise; hence the value of \(\text{arc} \sin(0.9090)\) is \(65.36^\circ\).
**Title: Solving a Right Angle Triangle Using the Pythagorean Theorem and Trigonometry**

**Step 1: Applying the Pythagorean Theorem**

Given:
- \( AB = c = 12 \)
- \( AC = b \)
- \( BC = a = 5 \)

Using the Pythagorean Theorem for the right angle triangle:

\[
(\text{Hypotenuse})^2 = (\text{Base})^2 + (\text{Perpendicular})^2
\]

\[
c^2 = a^2 + b^2
\]

Substituting the known values:

\[
12^2 = 5^2 + b^2
\]

Solving for \( b \):

\[
b^2 = 144 - 25 = 119
\]

\[
b = \sqrt{119}
\]

**Step 2: Calculating the Sine of Angle B**

According to the given figure:

\[
\sin B = \frac{\text{Perpendicular}}{\text{Hypotenuse}} = \frac{b}{c}
\]

\[
\sin B = \frac{\sqrt{119}}{12}
\]

Calculating the approximate value:

\[
\sin B = \frac{10.90}{12} \approx 0.9090
\]

Finding angle B:

\[
B = \sin^{-1}(0.9090) \approx 65.36^\circ
\]

**Answer: \( B = 65.36^\circ \)**
Transcribed Image Text:**Title: Solving a Right Angle Triangle Using the Pythagorean Theorem and Trigonometry** **Step 1: Applying the Pythagorean Theorem** Given: - \( AB = c = 12 \) - \( AC = b \) - \( BC = a = 5 \) Using the Pythagorean Theorem for the right angle triangle: \[ (\text{Hypotenuse})^2 = (\text{Base})^2 + (\text{Perpendicular})^2 \] \[ c^2 = a^2 + b^2 \] Substituting the known values: \[ 12^2 = 5^2 + b^2 \] Solving for \( b \): \[ b^2 = 144 - 25 = 119 \] \[ b = \sqrt{119} \] **Step 2: Calculating the Sine of Angle B** According to the given figure: \[ \sin B = \frac{\text{Perpendicular}}{\text{Hypotenuse}} = \frac{b}{c} \] \[ \sin B = \frac{\sqrt{119}}{12} \] Calculating the approximate value: \[ \sin B = \frac{10.90}{12} \approx 0.9090 \] Finding angle B: \[ B = \sin^{-1}(0.9090) \approx 65.36^\circ \] **Answer: \( B = 65.36^\circ \)**
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