8 points 12 1. Suppose you know that sin = 75 and that 0 is in quadrant 2. Use the double angle formulas to calculate sin(20) exactly. SHOW YOUR WORK. 2. The sound produced by pushing a button on a touch-tone phone can be described using the formula below: y = sin(2ult) + sin(27ht) where I and h are the low and high frequencies. 6 points (a) Write a formula that describes the sound produced by pushing 2 if the low frequency is 697 cycles per second and the high frequency is 1336 cycles per second. 8 points (b) Use a sum-to-product formula to rewrite the sum above as a product. State which formula you used, and SHOW YOUR WORK. 18 points 3. Use a sum-to-product formula to find all of the solutions with 0