$\int\left(\frac{x^5}{\left(x^6+1\right)^6}\right)dx$

$81x^2-4v^2$

$\left(a+x^2\right)+\left(x-y\right)^2+\left(x^2-y^2\right)\cdot\left(m+x-n\right)$

$\int\frac{1}{\left(x\sqrt{4x^2-25}\right)}dx$

$\int_1^{\infty}\left(\frac{9}{\sqrt[7]{x}}\right)dx$

$\left(x^2+4x+3\right)\left(\frac{1}{2\sqrt[2]{x}}\right)$

$\int\:8x^2\left(3x^2-4\right)^5\:dx$