I feel pretty dumb right now but I need help writing this equation in word form(?) (I need to describe how I got the equation)

-0.688cos(2pix/24.093)+0.818

Huh?

0.819 minus 0.688 times the cos of (2 pi over 24.093)

This is what I needed. Thank you so much!

Or do you want to explain how the graphed morphed from the original parent graph f(x)=cos x ?