What is the period of the function f(x) = sin x?

If f(x) is an even function, where f(x) $$\ne$$ 0, then which one of the following is correct?

If f : R $$\to$$ S defined by f(x) = 4 sin x $$-$$ 3 cos x + 1 is onto, then what is S equal to ?

Read the following information and answer the two items that follow.

Let f(x) = x², g(x) = tan x and h(x) = log x.

For $$x = {{\sqrt \pi } \over 2}$$, what is the value of $$[ho(gof)](x)$$ ?