$\left(x+2y\right)^2-\left(x-1\right)^2$

$\left(a^2+2b^2\right)\left(a^2-b^2\right)$

$-4\:+\:5\:+\:4\:+\:3$

$\left(x^3+x^2-7x+2\right)+\left(x-2\right)$

$\int\frac{1}{\left(x+1\right)\left(x^{2}+x+1\right)^{2}}dx$

$8x^2-y^2=1$

$\int\left(\frac{e^{-2x}}{8+e^{-2x}}\right)dx$