Evaluate int((e^x-e^(-x))/(e^x+e^(-x)))...

Evaluate `int((e^x-e^(-x))/(e^x+e^(-x)))dx` and the value is (A) `log|e^x+e^-x|` (B) `log|e^x+e^-x|+k` (C) `log|e^x-e^-x|+k` (D) none of these

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