$-4xy-9xy$
$\frac{2x}{x^2+x}$
$w=x^2+y^2$
$\frac{dy}{dx}+8y=4$
$\cos\left(2x\right)=3-5\sin$
$4+2+1.4$
$\left(3\left(-2\right)^2-\left(\frac{1}{2}\right)^3\right)$
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