3 x 7*x + atan(x) + 5
7*x^3 + atan(x) + 5^x
1 2 x ------ + 21*x + 5 *log(5) 2 1 + x
x 2 2*x 42*x + 5 *log (5) - --------- 2 / 2\ \1 + x /
2 2 x 3 8*x 42 - --------- + 5 *log (5) + --------- 2 3 / 2\ / 2\ \1 + x / \1 + x /