$\int\left(x^2+4\right)^{-5}dx$
$-15+200$
$\frac{d}{dx}\left(y=cos\left(2x\right)\right)$
$9\left(-2\right)^2+4\left(2\right)-93$
$\frac{5x^2+33x+23}{x+6}$
$-3x+2x^2+x^2-3x$
$\frac{dy}{dx}=\frac{x^2+4}{y^2-5}$
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