$7y-4y+y$

$\left(3n^6\:\:-7n^3\:\:+\:12\:\right)\left(3n^6+7n^3+12\right)$

$\frac{1}{4}\int\left(\frac{x^3}{\sqrt{16-x^2}}\right)dx$

$\frac{d}{dx}\left(\frac{\log_{10}\left(x\right)}{x^3}\right)$

$\frac{9}{16}x^{2}-25y^{2}$

$20a^{x+1}-54a^{x-1}$

$f\left(t\right)=-3\cos\left[\frac{\pi}{3}\left(t+5\right)\right]-100$