You can put this solution on YOUR website! find amplitude and phase shift of a graph of the equation y=3cos(x+pi)
----------
Form: y = acos(bx+c)
|a| = amplitude
Period = 2pi/b
shift = -c/b
----------------
Your problem:
amplitude = 3
phase shift = -pi/1 = -pi
=============================
Cheers,
Stan H.