Question

Use the graph below to answer the question that follows:

Answer 1

By graphing the given points, we will get the attached figure
which represents:
                                          f(x) = 3 sin x
but sin x = cos (x - π/2)
                                     ∴  f(x) = 3 cos ( x - π/2 )

The correct choice is option ⇒⇒⇒ f(x) = 3 cos(x − pi over 2 )