$\left(5x\right)^2-\left(2\right)^2$

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

$\:\left(n^2\:+\:2n\:+\:1\right)\left(n^2-\:2n\:-\:1\right)$

$\frac{dx}{dt}+x^2\:=\:x$

$\int_4^{10}\left(x^3\cos\left(x\right)\right)dx$

$\sqrt{3+x\left(x+1\right)^2}$

$4\cdot4^4\cdot4^{-1}$