$\left(m-7n\right)\left(m-4n\right)$

$xy^5+xy^5$

$\lim_{x\to3}\left(\frac{x-4}{x-3}\right)$

$\frac{\sec\left(x\right)^2\sin\left(x\right)-\left(1+\tan\left(x\right)\right)\cos\left(x\right)}{\sin\left(x\right)^2}$

$n^{2}x=-3$

$\left(x-1\right)\left(x^2-x-8\right)$

$\int\frac{x\sin x}{4}\:dx$