Prove each of the following using identities, showing all work in the process: A.) cos(x+pi/3) + sin(x-pi/6) =0 B.) cos^4(x) - sin^4(x) = cos(2x)

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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Prove each of the following using identities, showing all work in the process:

A.) cos(x+pi/3) + sin(x-pi/6) =0

B.) cos^4(x) - sin^4(x) = cos(2x)

C.) 1+sin(2x)/sin(2x) = 1+1/2sec(x)csc(x)

Expert Solution
Step 1

Given:

(1)  cosx+π3+sinx-π6 = 0

(2)  cos4x-sin4x = cos(2x)

(3) 1+sin2xsin2x=1+12secxcosx

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