$84^2-74^2$
$\frac{dy}{dx}\:+\:\frac{2y}{x+3}\:=\:2\left(x+3\right)$
$\frac{\left(sinxtanx+cosx\right)}{cscxsecx}$
$3x-2\ge2$
$\frac{8x+7y}{-6};\:x=2;\:y=5$
$\int\frac{-3}{9+x^2}dx$
$\left(2a+3b^2\right)\left(4x^2+6xy+9y^2\right)$
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