$\left(\frac{1}{2}x+\frac{1}{2}y\right)^2$
$y^{''\:}-14y^{'\:}+49y=0$
$\left(6a^2b+5y\right)\left(6a^2b+5x\right)$
$\frac{dy}{dx}\left(5-2x^2\right)=3xy$
$\cos\left(x\right)\cos\left(-x\right)-sin\:x\:sin\left(-x\right)=1$
$9-6x\le5$
$2-b^2+b-3y^2-by+by$
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