$\int\left(\frac{e^{2x}}{1+e^x}\right)dx$
$-\left(2r-1\right)+r$
$4x^2-14\cdot2x+49$
$\frac{5}{\sqrt{x}}$
$\int-4e^{8x+4}dx$
$0+\infty$
$\frac{9b^3}{11b^1}$
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