Question

What is the y-value for f(x) = cos(x) when x = 360°?

Answer 1

In this problem y = f(x).

cos(360) = 1
cos(-90) = 0

tan(90) is undefined, or is equal to infinity, because the tangent function has a vertical asymptote at that point.

Hope this helped!

Answer 2

Thanks @ovidia!