//-sin(x) + x*cos(x) \ ||------------------ for x != 0| x || 2 | x E - |< x | + 2 *log(2) || | || 0 otherwise | \\ /
// /2*(-sin(x) + x*cos(x)) \ \ ||-|---------------------- + sin(x)| | || | 2 | | || \ x / | x 2 x - |<----------------------------------- for x != 0| + 2 *log (2) + e || x | || | || 0 otherwise | \\ /
// 3*sin(x) 6*(-sin(x) + x*cos(x)) \ ||-cos(x) + -------- + ---------------------- | || x 3 | || x | x 3 x - |<------------------------------------------- for x != 0| + 2 *log (2) + e || x | || | || 0 otherwise | \\ /