$\left(2x^{-5}-7\right)\left(2x^{-5}+7\right)$

$2z\left(x-3\right)+5z-4$

$\int\:\frac{3x}{\left(x-2\right)^2\left(x-5\right)}dx$

$\frac{sen^3u}{tan\:u\:-senu}=cos\:u\:\left[1+cos\:u\right]$

$\left(7\:^2b\:^3m\:^2y\right)\:\left(3\:^3b\:^2m\:^5y\right)$

$45\:x\:90$

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