1. Use the sum or difference identity for sine to find the EXACT value of sin 1950. 2. Find the value of cos(x - y) if both x and y are in Quadrant I and cos x = 9/41 and sin y = 7/25. 3. Verify that sin (x - -) = -cos x. 4. Use the sum or difference identity for tangent to find the EXACT value of tan 750. 5. Suppose that A is in Quadrant IV and cos A = 4/5, find the exact value of each expression. a) sin 2A b) cos 2A c) tan 2A 6. Verify the identity sin(12x) = 2sin6x cos6x