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int(dx)/(e^x+e^-x)=....

`int(dx)/(e^x+e^-x)=`_____.

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`int(dx)/(e^x+e^-x)=int(e^xdx)/(1+e^(2x))=int(dt)/(1+t^2)` (where `e^x=trArre^xdx=dt)=tan6-1t+c`
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