$$5x^2+4x+3-3x+2x^3-7x^2+6x$$

$$\int\left(2yx\right)dx$$

$$\frac{1}{3}x^2y^3+\frac{9}{2}x^2y^3+\frac{4}{3}x^2y^3$$

$$\int\frac{x+14}{x^2-2x-8}dx$$

$$x^4+3x^3+x^2-3x-2$$

$$-\frac{8}{3}\cos^3$$

$$\frac{x^2+4x+4}{x^2-1}$$