$\frac{d}{dx}-2x^2+8$
$81n^2-252n+196$
$2\:log\:\left(4x\right)=4$
$-\left(-14\right)-\left(-7\right)+\left(-13\right)+2$
$\int\left(\frac{e^{2x}}{1-e^{2x}}\right)dx$
$4n-8\le12$
$tan2\left(x\right)=-2.85$
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