$2x^ay^3\:\:+\:3x^5y^7\:-\:x^by^8$

$\lim\:_{x\to\:0}\left(\frac{\sqrt[3]{\left(cos\left(x-1\right)\right)^2}}{tan\left(x\right)}\right)$

$\lim_{x\to\pi}\frac{\left(x-\frac{\pi}{2}\right)\sin\left(x\right)\cos^2\left(x\right)dx}{\sin^3\left(x\right)\cos^3\left(x\right)dx}$

$2x-3>9$

$\left(32aba^7\right)^0$

$\lim_{x\to\infty}\left(\frac{-3x^2+7}{x}\right)$

$4u^2-2uv$