$\frac{dy}{dx}\left(\frac{x^2-3}{2x+1}\right)$

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

$5a^2\left(3+b\right)-6-2b$

$\frac{dy}{dx}\left(x+tan\left(xy\right)=-1\right)$

$9a^2-25b^6$

$\int_{\infty}^e\left(\frac{1}{x\ln\left(x\right)}\right)dx$

$\sqrt{a^{16}}$