Question

If f(x) =2x and g(x) = cos(x) then g(f(π/2)) = ?
Number 2 in picture

Answer 1

(4) -1.

Explanation:

First evaluate f(π/2) which is 2 * π/2 = π.

So g(f(π/2)) = g(π)

= cos π

= -1.