$\left(20\cdot x\right)^2$
$-3\pi+w=2\pi$
$\frac{dy}{dx}+\frac{y}{x}=x^2e^x$
$\left(-7a^2+7a-2\right)+\left(8a^2-2a-3\right)$
$\left(d+1\right)\left(d-2\right)y=\cos\left(\frac{x}{2}\right)$
$f\left(x\right)=e^{2x+1}$
$1+\sin2x=\frac{1}{9}$
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