$x^2-2x+x-2x+3xy-6y$

$\int\left(x\left(x^2-3\right)\right)dx$

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

$\left(\frac{1}{2}x\:+\:\frac{1}{4}\right)^2$

$\frac{\left(x+1\right)^9+7\left(x+2\right)^2+3}{x^2+2x+5}$

$1\sqrt{3}+2\sqrt{3}$

$\int c^{4x}dx$