1 sin 3sin .cos   Divide both sides with2cos2 2sec tan 3tan   22 tan 3tan 1 0     2tan 1 tan 1 0  1tan , tan 12 1 1, tan4 2    

sin12∘sin24∘sin48∘sin84∘=cos20∘cos40∘cos60∘cos80∘sin20∘sin40∘sin60∘sin80∘315None of these

. Without using a calculator, state the exact values of each of the following.a) cos π6b) sin 3π2c) tan−π6d) sin 3π4e) cos 4π3f) tan 2π3

Given 𝛼 = tan−1 𝑥, find the exact values of sin 𝛼 and cos 𝛼

c1 cos2 x +c2 sin2 x +c3 sec2 x +c4 tan2 x = 0when c1 = c2 = 1, c3 = -1, c4 = 1.Example 5CH3_21

Evaluate the following: 2 tan2 45° + cos2 30° – sin2 60°