$\left(4m^2n+7mn^2\right)\left(-3m^2n+2mn^2\right)$
$\int\left(\frac{7x+6}{x^9}\right)dx$
$\frac{dx}{dt}=xe^t+3e^t+x-3$
$2-x\le3$
$64a^2+80ab^2+25b^4$
$y'+x^{-1}y=cos\left(x^2\right)$
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