1. Prove by Mathematical Induction that 4+8+12+ ...+ (4n) = 2n(n+1) is true for all positive integers, n .

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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1. Prove by Mathematical Induction that 4+8+12+ ...+ (4n) = 2n(n+1) is true for all positive integers, n .

2. Expand and simplify (2x - 5y)3

3. Sketch the polynomial function y = x(x+1)3 (x-1)2 (x+2)

4. A rational function is given as h(x) = x/ (x-1)(x-3). Sketch the graph of h(x), showing all the intercepts and asymptotes clearly.

5. Prove the following trigonometric identity: 1/sin2x - 1/tan2x = 1

6. Express y = 6Cos(theta) + 8Sin(theta) in the form y = rSin(theta + alpha), where alpha is an acute angle in degrees. Hint : Use Sin(theta+alpha) = Sin(theta)Cos(alpha) + Cos(theta)Sin(alpha)

7. Solve 2Sin 2x - 1 = 0 for 0 <_ x <_360a .

8. A complex number is given as z =1 root 3 i .
i. Express z in polar form.
ii. Use De Moivre’s Theorem to find z5 . Hint: zn = rn (Cosn(theta) + iSin n(theta))

9. Given v = 1-3i and w = -1+5i, find
i. v+w
ii. |v|

10. A sequence an is defined by an = n+2/4n+1
i. Find the first 4 terms of the sequence
ii. Simplify an+1 - an and determine whether the sequence is increasing or decreasing. 

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