$\frac{r^2-16}{r+4}$
$\frac{1+cosx}{sin^2x}$
$\frac{4x^2+4x-3}{3x-2}$
$\int\left(x^3-\pi^2x\right)\left(\sin\left(nx\right)\right)dx$
$7x+4=8x-2$
$2p+7+16p+49$
$4y'\left(x\right)+5y\left(x\right)=cos\left(x\right)$
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