$\int\sec^2\left(5x^9\right)x^8dx$

$cos\left(tan^{-1}\left(\frac{x}{3}\right)\right)$

$\int\frac{\cot\left(\ln x\right)}{x}dx$

$2x^2-5x+7=\:0$

$\frac{d^2}{dydx}=x\sec\left(y\right)$

$\sqrt{x\left(x+7\right)}$

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