$\lim_{x\to9}\frac{x^3-2x^2-71x+72}{x-9}$

$2\log\left(x+3\right)+6=6\log\left(x+3\right)+2$

$2\cos^2\left(a\right)+6\cos\left(a\right)\sin\left(a\right)+10\sin^2\left(a\right)$

$\int x^2e^{-2x^3}\:dx$

$\lim_{x\to\infty}\left(\frac{3x^2+5x-2}{5x^3-5x+2}\right)$

$\left(3t^5-1\right)^2$

$\frac{1}{-5}\cdot0$