$11\left(-4\right)\cdot\left(-9\right)$
$900+450$
$6x^2-7y^2=93$
$\frac{x^2-3x^2}{x^2-9}$
$x^2\cdot\:dy\:+\left(2y-xy\right)\:dx=0$
$\left(\sqrt[2]{x-\frac{1}{\sqrt[2]{x}}}\right)^4$
$\frac{dy}{dx}+y=4x^2$
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