$\frac{d^2}{dx^2}\left(\tan\left(2x^4+x\right)\right)$

$2\{\left(x+y\right)^{2}\left(x-y\right)^{2}-4x^{2}$

$\sqrt{4x}$

$\int\frac{1}{\sqrt{81-x^2}}\:dx$

$\frac{dy}{dx}\left(5x^2+4x-8\right)$

$\frac{dy}{dx}\left(2csc\left(x\right)cot\left(y\right)=1\right)$

$7x^{3}+3x^{2}$