# Math Help - amplitude and period...need help!!

1. ## amplitude and period...need help!!

What are the amplitude and period of the function f(x)=-3+2cos((pi-3)x+4)???

2. Given $y = Acos(B(x + C)) + D$ or $y = Asin(B(x + C)) + D$,

A = amplitude
$\frac{2\pi}{B}$ = period
C = phase (horizontal) shift
D = vertical shift