How do you change a sin function into a cos function

This is the sin equation that I have created via my graphics calculator to fit the data I was given:
y=29.9999924*sin(1.30000007x+1.5707959…

Do I just simply write cos instead of sin ? Do any other changes to values A,B,C and D need to be made?

THANKSSS SOO MUCH !!!

y=30sin(1.3x+1.57079592)+35 ---> y=30cos(1.3x)+35