$\int\:\frac{x^2+x+1}{x}dx$
$\lim_{x\to+0}\left(2x\right)^x$
$\lim_{x\to\pi}\left(\frac{1+\cos\left(2x\right)}{1-sen\frac{x}{2}}\right)$
$\left(1+2x\right)^2\frac{dy}{dx}-y^2=0$
$4r+-4=-12$
$\frac{d}{dx}cos\frac{3x}{2}$
$\int\frac{\sqrt{64-16x^2}}{4x^2}dx$
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