$\left(a-11\right)\left(x-2\right)$

$\left(-3189\right)-\left(-1218\right)$

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

$\left(x+30\right)^2$

$\int^32\left(x^2+2\right)dx$

$\left(12\right)\:x\:\left(-2\right)\:x\:\left(-7\right)$

$\frac{d}{dx}\left(e^{7xy}=9y\right)$