$3csc\:u-6=0$
$\frac{dy}{dx}=\frac{-y^3}{x^2}$
$6n^2+9n=12$
$4x^2+9y^2=16$
$15x\:mas\:20x\:mas\:x$
$m^2+m+9$
$4x^2\:+\:29x\:+\:45$
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