$a^{6}-b^{8}$

$\lim_{x\to\infty}\left(\frac{x^2-2x+1}{x^3-4}\right)$

$180\left(45+60\right)$

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

$t^{10}y'=\frac{\left(6t^{12}+t^9\right)}{3y^2}$

$\left(2+3x^4-x\:^3\right):\:\left(x-3\right)$

$\frac{5x}{x+3}=3+\frac{1}{x+3}$