$-3.3^2$
$\log\left(100\right)=2$
$\int\left(cos\right)^{-1}\:2x\:dx$
$21\left(\frac{2}{3}\right)$
$3x+7=x+3$
$\frac{x^2+4x-5}{x^2-2x-3}+\frac{2}{x+1}$
$x\:\frac{dy}{dx}+2y=3$
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