$\int\frac{2x^3+7x+4}{\left(x^2+4\right)^2}dx$

$\frac{sen2\left(x\right)+\cos2\left(x\right)-1}{\sqrt{1-\sin2\left(x\right)}}$

$\int\left(\frac{1}{\left(y^2+1\right)}\right)dy$

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

$\frac{dy}{dx}\left(x^2-y^2=25\right)$

$\lim_{x\to\pi}\left(5\sin\left(x\right)^2\right)$

$-\frac{1}{3}\:.\:3$