$\frac{x^2}{x+3}\ge2$
$x=5^y$
$\int\frac{1}{5}\:\:\left(cosx+3senx\right)dx$
$\lim_{x\to-4}\left(\frac{x^2+x-12}{x+4}\right)$
$\frac{1}{16}\cos\left(2x\right)^4$
$\frac{dy}{dt}=2ty-8t$
$\frac{d}{dx}\:y+2\sqrt{xy}=3+x^2$
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