$\lim_{x\to91}\left(csc\:x\right)$

$\frac{dy}{dx}=\left(1+y\right)\left(\frac{x}{\sqrt{x^2+4}}\right)$

$f\left(x\right)=\frac{3}{8}x-\frac{1}{3}+\frac{7}{3}$

$\frac{2\pi}{3}+\pi$

$2a^2-2$

$\left(-3x+5xy^2\right)^2$

$\lim_{x\to infinity}\left(ln\left(7x\right)\right)^{\frac{7}{lnx}}$