$\int\frac{r^2}{\left(r+4\right)}dr$
$-7^2c+15b^2c-21b^2c-3b^2c$
$5a+1f$
$\frac{4x^2-36}{2x+6}$
$\frac{dy}{dx}-8tan\left(x-y\right)=0$
$\frac{1}{n\cdot\left(n+2\right)}$
$3\sqrt{ab}+\:\sqrt{4a^3b\:}-\:2\sqrt{0.25ab\:}-\:a\sqrt{ab}-4\sqrt{\frac{1}{4}ab}$
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