Question

For the function y= -1 + 6 cos( (2 pi/7)(x-5) ), what is the minimum value?

Answer 1

\[y=-1+6 \cos(1/7 (2 \pi) (x-5))\]
goes as low as -7
(at x = 3/2+7 n for integer n, for example)

Answer 2

This is a global minima. Which I think is what you were asking yes?

Answer 3

Yes thank you!