$\int\:\frac{sen^5x}{\sqrt{cosx}}dx$

$\int-3x\cos\left(2x\right)dx$

$\frac{25n^{12}-625}{5n^6+25}$

$\frac{3x^2-19-6x+9x^4}{\left(3x^2-4\right)}$

$\lim_{x\to0}\left(\frac{\sqrt{1+\tan\left(x\right)}-\sqrt{1+\sin\left(x\right)}}{x^3}\right)$

$\left(2x-y\right)\left(3x+y\right)$

$s\left(s-5\right)$