Question

I need to know if I'm correct. :P
Use the graph below to answer the question that follows:
http://prntscr.com/b6f4m8
What trigonometric function represents the graph?



f(x) = −3 sin(x − pi over 2 )
f(x) = −3 cos(x − pi over 2 )
f(x) = 3 cos(x − pi over 2 )
f(x) = 3 sin(x − pi over 2 )

Answer 1

It's either B or D.

Answer 2

I got C