20，I am not sure how to do it
Given:f(x) = x^4 - xg(x) = x^4 (even)h(x) = -x (odd)f(x) as a sum of an even function and an odd functionf(x) = g(x) + h(x)s(x) = 1 / (x^4 - x)s(x) as a sum of an even function and an odd functions(x) = 1 / [g(x) + h(x)]
