$-4^8\cdot4^4$

$\frac{dy}{dx}\left(y=\left(\frac{x+3}{xcosx}\right)\right)$

$\left(-\frac{2}{5}h-7\right)\left(\frac{2}{5}h+7\right)$

$\frac{v}{4}=\frac{9}{v}$

$-\tan\left(x\right)^2\cos\left(x\right)^2=-\sin\left(x\right)^2$

$3\left(1\right)^2+2\left(1\right)$

$5n\:-\:1\:+\:2n$