$\left(-2\:\frac{3}{2}\right)$
$a^2-3ab+b^2-5ab+a^2-b^2.8ab-b^2-2a^2$
$16-40b+25b^2$
$\frac{dy}{dx}+\:2x=\:1\:+e^{-2t}$
$\int\frac{\left(4+7x\right)}{1+x^2}dx$
$\frac{d}{dx}x\sqrt{x^2+40}$
$\frac{dy}{dx}=5x\cdot cos\left(9y\right)$
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