$\lim_{x\to\infty}\left(\frac{2x^2+x}{e^{2x}}\right)$

$\left(x-5y\right)\left(x+5y\right)$

$400p^6-256q^4$

$\tan\left(b\right)\left(\cot\left(b\right)+\tan\left(b\right)\right)=\sec\left(b\right)^2$

$\frac{15m^{-3}n^2p^4}{-5mn^4p^5}$

$\int sen\frac{3}{2}\:x\:dx$

$3x^2+6x+6$