$\int x\cos\left(x^2+4\right)\sin\left(x^2+4\right)dx$
$m^2+10m-200$
$-13z+yz+9z+7y-7yz$
$\int\:4r\:e^{3r}dr$
$\frac{x^3+x^2-1}{x^2+x}$
$\frac{d}{dx}e^{2z}\left(z+6\right)$
$x^2+y^2+z^2-6z=16$
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