$\Large\int \frac {e^xdx} {e^{2x}+1}=$ $$(a)\;log (e^x+e^{-x}) \qquad (b)\;log (e^{2x}+1)\qquad(c)\;\tan^{-1}(e^x) \qquad(d)\;\tan^{-1}(2e^x)$$

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