$\frac{x^{3+1}}{x^2-9}$
$\left(2a+4\right)\left(2a-4\right)$
$y^6-4y^3+3$
$\frac{d}{dx}x^2+1$
$\frac{2x^2+5x-18}{x+4}$
$\int\frac{x^3+1}{\left(x^4\:+\:4x^3\right)}dx$
$\frac{dx}{x^2+1}=-\frac{\cos\left(y\right)}{\sin\left(y\right)}dy$
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