A. Give the exact value of the following without using calculator. Use the indicated identity. 1. cos90 (Double Angle Formula) 2. sin 30 (Half Angle Formula) 3. tan 15 (Sum and Difference Formula) B. If sinA = > and tanB = - 24 ", A and B are in OII, find: 13 4. sin(A + B) 7. tan 5. cos 2B 6. tan(A - B) 8. sin C. Use a product of sine and cosine formula to convert each expression. Simplify if possible. 9. sin20'cos10 10. cos50'cos90