Question

Use the graph below to answer the question that follows:
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

please help mathmale

Answer 2

It has to do with +sin.
The rest can easily be told :)