1.

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

Answer»

SOLUTION :`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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