$\left(-5l^2m^3n\right)\left(7l^3m^2n\right)$
$x^2+y-9=0$
$4x-5\ge2x+3$
$\left(-39\right)-\left(-6\right)$
$3\left(2x-1\right)^2+21=36x^2-36x+36$
$\frac{dy}{dx}=\frac{\left(y^2\right)}{x-1}$
$\left(1-\cos a\right)\left(1+\cos\alpha\right)+\cos^2a$
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