$y^2\:+12ya+36a^2$
$\sqrt{20}\cdot\sqrt{45}$
$\frac{dy}{dx}=5\left(1-y\right)$
$\left(3x+abc\right)^2$
$y'+2y=xy^3$
$\int\frac{9x-45}{x^2-81}dx$
$-5\left(-5+7\right)$
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