Homework 3
30 points
Complete your homework and submit it to your instructor.
- Verify the identity: cos x + sin x tan x = sec x.
- Given
and 
, find the exact value of the other five trigonometric functions. - Verify: cos(180° + x) = -cos x.
- Find the exact value for sin(x + y) if
and 
. Angles x and y are in the fourth quadrant. - Find the exact value for cos 165° using the Half-Angle Identity.
- Verify the identity: 1 - cos 2x = tan x sin 2x.
HINT: You will have to work with both sides of this equation.