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

$-\lim_{x\to0}\left(x^2-4\right)$

$\left(-6-2s\right)^{2\:}$

$9x-4y\sqrt{x^2+1}\left(\frac{dy}{dx}\right)=0$

$\lim_{x\to\pi}\left(x-\pi\right)^2\cos\left(\frac{1}{x-\pi}\right)$

$\frac{1-\sin^2\left(x\right)+\sin^2\left(x\right)}{\sin\left(x\right)}$

$\ln\left(x\right)\frac{dx}{dy}=\frac{x}{y}$