найти производную функции x^3/x^2+5

(x^3) / [(x^2) + 5] = {[3*(x^2)] *[(x^2) + 5] - 2x*(x^3)} / [(x^2) + 5)]^2 = [2*(x^4) + 15*(x^2)] /  [(x^2) + 5)]^2