$\left(5x-y^2\right)^3$

$f\left(x\right)=\left(x^3+2x-7\right)\left(3+x-x^2\right)$

$\int_1^{\infty}\left(\frac{2+\cos\left(x\right)}{x^2}\right)dx$

$\int\left(e^x\sqrt{81-e^{2x}}\right)dx$

$\int\left(x^2+5x+4\right)^3\left(2x+5\right)dx$

$\frac{\left(x^2-5x+6\right)}{\left(x^2-6x+8\right)};\:x=2$

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