If sin (X) = 1/2, evaluate each of the following:

a) sin(x - pi/
2) b) cos(pi/2 - x)
c) tan(pi/2 - x)

By expressin each angle as a sum/difference of known angles, find an exact expression (i.e., no decimals) for:

a) sin(5pi/12)
b) cos(7pi/12)
c) tan(11p1/12)

Determine equivalent trigonometric expressions for each of the following. Feel free to use any of the identities that you learned in the previous lessons.

a) cos(3a + 9b)
b) tan(4a - 3b)
c) 2 sin(x/2) cos(x/2)