$\lim_{x\to0}\left(\frac{x^2+2x-1}{x^2-1}\right)$
$\frac{dy}{dx}=\:2x+7$
$4280+600-1500$
$\left(3x^2-1\right)^2-4\left(1-x\right)^2$
$25c^2+60c+36$
$\left(-36\right)-\left(-70\right)-\left(11\right)$
$\frac{dy}{dx}e^x\sin\left(y\right)+e^x\cos\left(x\right)-1$
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