$\left(x-x^3\right)\left(x-x^3\right)$

$\left(8bc^2-7b^3c\right)\left(8bc^2+7b^3c\right)$

$\pi\int_0^{\sqrt{34}}\left(34-x^2\right)^2dx$

$x=75-y^2$

$5m^3+3m^3n+n^3restar\:2m^3-3m^2n+2n^3$

$\left(10xy^4\right)^2$

$\lim_{x\to-\infty}\left(\sqrt{\left(x^2+4x\right)}-\sqrt{\left(x^2-4\right)}\right)$