Write each expression as the sine of an angle.

14. Prove that sin(x + *) = - sin(x) 15. Prove that sin(x - y) + sin(x +y) = 2sin(x) cos(y)14. Use the fact that cos($ -x) = sin(x) (shown in examples), to show that sin ($ - x) = cos(x). 15. Prove that cos(x - y) + cos(x +y) =2cos(x) cos(y).Find the exact value for each tangent expression. 1. tan 2. tan 12 3. tan -1653 4. tan 255 5. tan -150