Mark the correct alternative in the following:

Let and h(x) = f(x) g(x). Then, h(x) = 1 for

Mark the correct alternative in the following:

If x ≠ 1 and is a real function, the f(f(f(2)) is

Mark the correct alternative in the following:

If f(x) = cos (log_e x), then is equal to

Mark the correct alternative in the following:

If for x ∈ R, then f (2002) =

Mark the correct alternative in the following:

The function f : R → R is defined by f(x) = cos² x + sin⁴ x. Then, f(R) =