Question

Can somebody help me.
Let the function h be defined by h(x) = 2 cos(10x) + 12. The maximum value of h is attained at which of the following values of x?
A. pi over 5
B. pi over 10
C. pi over 15
D. pi over 20
E. pi over 40

Answer 1

i know how it works in trigonometry

Answer 2

I would just do trial and error plug in the values they give you and see which one is largest

Answer 3

max of cosine is 1 at \(\theta =0,2\pi,4\pi,...\)

Answer 4

set \[10x=2\pi\] solve for \(x\) in one step