Find each of the following functions. f(x) = 2−2x, g(x) = cos(x) (a) f∘g State the domain of the function. (Enter your answer using interval notation.) (b) g∘f State the domain of the function. (Enter your answer using interval notation.) (c) f∘f State the domain of the function. (Enter your answer using interval notation.) (d) g∘g State the domain of the function. (Enter your answer using interval notation.)