$4x+13=x+4$
$4x\left(9x-2y^2\right)$
$\int\frac{4}{x^2+5x+6}dx$
$\frac{dy}{dx}=\frac{xy+x}{x}$
$\lim_{x\to\frac{\pi}{2}}\left(\frac{1-sin\left(x\right)}{cos\left(x\right)}\right)$
$\left(9x^2-5x-46\right)+\left(2x^2+7x\right)$
$4x^3-6y^3$
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