2 x + sin(x) - acot(x)
x^2 + sin(x) - acot(x)
1 ------ + 2*x + cos(x) 2 1 + x
2*x 2 - sin(x) - --------- 2 / 2\ \1 + x /
2 2 8*x -cos(x) - --------- + --------- 2 3 / 2\ / 2\ \1 + x / \1 + x /