$\:4k^2\:-\:20ks\:+\:25s^2$

$1-\left(5-3+2\right)-\left|5-\left(6-3+1-2\right)\right|$

$\frac{m^4n^2p^5r^{-3}}{p^5m^7n^{10}r^4}$

$\frac{d}{dx}\frac{1}{3}x^2-\sqrt[3]{x}+2x$

$\frac{4ab^2}{3bc}$

$\frac{dy}{dx}\sin\left(x\right)^2=1+\cos\left(x\right)$

$2\sec^2x-8\tan\:x=-4$