Integrating simple polynomials and few trigonometric functions
Input:
| 1sin x - cos x dx
| 1x^2 + x + 1sin x + 1cos x + 1 dx
| 1x^-7 + 5x + 7x^6 - x^-2 + 1sin 10x –1cos 4x dx
Output:
-cos(x) -sin(x) + C
(1/3)x^3 +(1/2)x^2 +x -cos(x) +sin(x) + C
x^7 +(5/2)x^2 +x^-1 -(1/6)x^-6 -(1/10)cos(10x) + C