1.  Find cos 165^o.

2.  Find cos (A - B) when cos A = 7/25 and tan B = -3/4, A is in quadrant I and B is in quadrant IV.

3.  Find cos [arctan (4/3) - arctan (7/24)].

4.  Find tan (5p/6  -  q)  when cos q = 3/5.

5.  Solve for x:  2 sin (30^o + x) = 3 cos x

6.  Solve for x:  sin 2x = 5 cos²x

7.  Solve for x:  Tan^-12x = Sin^-1x

8.  Write as an algebraic expression:  cos [arctan (x - 1) + arcsin x]

9.  Rewrite as a product:  sin 3x - sin 5x

Answers