$\cos\left(x\right)=.55$
$-x^2=3$
$x^2-20x=96$
$-1-\left(-2+1\right)$
$-x^2-30x-825$
$\left(\frac{2x-3y}{y\:\:\:\:x}\right)^3$
$\frac{dx}{\:dy}-y^2=9$
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