$u^2+24u=35$

$\lim_{x\to\infty}\left(\frac{x^{2}-x}{x+10}\right)$

$7\cdot3+6$

$\frac{d}{dx}\:\frac{e^x+\:e^{-x}}{e^x-e^{-x}}$

$2\times ydx+\left(x^2-1\right)dy=0$

$\left(8z+3w\right)^2$

$\sec^2\left(\tan^{-1}\left(2\right)\right)\csc^2\left(\tan^{-1}\left(3\right)\right)$