$9b^2-100m^2$
$\frac{x^3+12x+3}{x^2-1}$
$\frac{dx}{dy}=\frac{x}{y^2}$
$4\left(6\:\:+\:\:3y\right)$
$2+\cos^2\left(x\right)=\sin^2\left(x\right)+3\cos\left(x\right)$
$\frac{x}{x^2-9}-\frac{1}{x-3}$
$2\left(\frac{4}{5.4}+\frac{4}{4}\right)$
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