$16\sqrt{\frac{\sqrt{65}-7}{2\sqrt{65}}}-16\sqrt{\frac{\sqrt{65}+7}{2\sqrt{65}}}$

$\frac{1+\csc\theta}{\tan\theta}$

$\frac{15^{-2}\cdot\:\left(12^3\cdot\:15^{-3}\right)^4\cdot\:15}{15^7\cdot\:\left(15^{-1}\right)^{-4}\cdot\:12^{19}}$

$ln\left(x^{7cos\left(x\right)}\right)$

$\frac{\left(5+\sqrt{7}\right)}{\left(3-\sqrt{7}\right)}x\frac{\left(5+\sqrt{7}\right)}{\left(3+\sqrt{7}\right)}$

$\frac{d}{dx}\left(y\sinh\left(3x\right)+\tanh\left(2xy\right)=7\right)$

$\frac{1}{2x^2+9x-5}$