$9-18n+36n^2$
$x+\frac{1}{x}=9\:$
$\frac{dy}{dx}=\left(\left(-\frac{1}{2}\right)\sin\left(x\right)^2\right)y$
$1.5\cdot\frac{27}{2}$
$2x^2-4x+7=0$
$4x^4+\:24x^2\:y^4+\:36y^8\:\:$
$-405a-80a+7a-88g+123g$
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