//-sin(x) + x*cos(x) \ ||------------------ for x != 0| || 2 | 4 - |< x | + 10*x || | || 0 otherwise | \\ /
// /2*(-sin(x) + x*cos(x)) \ \ ||-|---------------------- + sin(x)| | || | 2 | | || \ x / | 3 - |<----------------------------------- for x != 0| + 40*x || x | || | || 0 otherwise | \\ /
// 3*sin(x) 6*(-sin(x) + x*cos(x)) \ ||-cos(x) + -------- + ---------------------- | || x 3 | || x | 2 - |<------------------------------------------- for x != 0| + 120*x || x | || | || 0 otherwise | \\ /