$\left(x^{a+1}+3x^{a-2}\right)^2$

$\sqrt[3]{81x^2y^4}$

$\frac{2a+5>\frac{8}{2}}{1-3a\ge\frac{7}{4}}$

$0ab\:+\:10am\:-\:5b\:-\:5m$

$\lim_{x\to10}\left(\frac{sin6x}{7x}\right)$

$\frac{\sin^2\left(x\right)-\cos^2\left(x\right)}{\sin^2\left(x\right)}=1-\cot^2\left(x\right)$

$5\sqrt{2}\cdot\sqrt{4}$