$2x^{-3}\cdot2x$
$2x^3-3x^2-x+4$
$\frac{dy}{dx}x+2y=e^{x^2}$
$n+n$
$-7+2a>9$
$\frac{dy}{dx}=2\sin\left(x\right)-e^{-x}$
$b^2+b^2+b^2+b$
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