$\left(-2x^{a-2}\right)\left(7x^5-8x^2+6x^3-9x+2\right)$

$x^2+10x+50=50$

$\frac{xy\sqrt[3]{x^2y^2}}{2}$

$\lim_{x\to2\pi}\left(\frac{\cos\left(x\right)-1}{x-2\pi}\right)$

$x^{\frac{-3}{2}}=\frac{1}{x^{\frac{2}{3}}}$

$\frac{csc\theta\:+cot\theta\:}{tan\theta\:+sin\theta\:}=cot\theta\:\:csc\theta\:$

$x^2\sqrt{x^3}+1$