$\int12exdx$

$\int e^{\sqrt{\pi}\:}dx$

$\frac{3}{x-2}+\frac{2}{x^2-4x+4}$

$\left(\frac{1}{9}-a\right)^2$

$x\left(x+7\right)+\left(x+2\right)\left(x+3\right)\left(x+4\right)\left(x+5\right)$

$2\cos\left(x\right)-4\sin\left(x\right)\cos\left(x\right)=0$

$\left(5ax+y\right)\left(5ax-y\right)$