100 Page 10 of 12 12. Find the exact value for cos ( ) if tan(0) = - and 0 is in quadrant IV. 13. The graph of one complete period of a sinusoidal curve is given below. Write an equation that represents the curve in the form f(t) = Asin[B(t - h)] or y = A cos[ B(t - h)]. yA 0 X