$4x^2+28x+45=0$
$\frac{dy}{dx}=-\frac{4x}{3y^2}$
$x+3+\:x-6$
$\left(\sqrt{4x^2}\right)\left(\sqrt{4x^3}2^2\right)$
$9\:-4\left(2x\:-7\right)$
$\left(x+7\right)\left(x+3\right)\left(x+2\right)$
$\frac{\left(x+2\right)\cos\left(y\right)-\cos\left(y\right)}{x\cos\left(y\right)}$
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