$\frac{r^2}{r+4}$

$4x^2+20xy+25y^2$

$\left(-13\right)\left(-4\right)\left(-8\right)$

$\int\frac{4x^2-8x+1}{\left(x+2\right)\left(x^2-2x+3\right)}dx$

$\left(3a-d\right)^4$

$\int_{\frac{\pi}{12}}^{\frac{\pi}{4}}\left(csc\left(2x\right)cot\left(2x\right)\right)dx$

$\left(2x+\frac{3}{2}\right)\left(2x+5\right)$