y= -3cos(2x-pie/2) and y=-4cos(2x-pie/2) Two separate math problems

Determine the amplitude, period, and phase shift of each function. Then graph one period of the function.
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y=-3kosine(2x-pi/2)... pi/2=90 degrees, so yu hav... y=-3*sine(2x)... so yu hav a sine wave that go up & down twice as fast as sine(x)... & the y part is terned upside down bi the -3 in fromt... the 3 make it hier
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