1. Which expression is equivalent to cos ( ? – 2pi)?
–cos ?
sin ?
cos ?
–sin ?
2. Which expression is equivalent to cos 2 ? for all values of ? ?
cos^2 ? – 1
1 – 2 sin^2 ?
2 sin ? cos ?
cos^2 ? – sin^2 ?
3. Solve cos x tan x - sin^2x = 0 for all real values of x.
?k, ?/2 + 2?k
?/2 + ?k...