What is the function of cos that has an amplitude of 4, a period of 2π, and has a point at (0,2)

Answer 1

mmmhhh, how about
y = 4 cos x to start with
when x = 0 , y would be 4, but we need it to be 2, so

y = 4cos x - 1

https://www.wolframalpha.com/input/?i=graph+y+%3D+4cos+x+-+1