Evaluate integral of (e^x-e^(-x))/(e^x+e^(-x)) with respect to x

Evaluate integral of (e^x-e^(-x))/(e^x+e^(-x)) with respect to x
Let . Then , so . Rewrite using and .
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Let . Find .
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Differentiate .
By the Sum Rule, the derivative of with respect to is .
Differentiate using the Exponential Rule which states that is where =.
Evaluate .
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Differentiate using the chain rule, which states that is where and .
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To apply the Chain Rule, set as .
Differentiate using the Exponential Rule which states that is where =.
Replace all occurrences of with .
Since is constant with respect to , the derivative of with respect to is .
Differentiate using the Power Rule which states that is where .
Multiply by .
Move to the left of .
Rewrite as .
Rewrite the problem using and .
The integral of with respect to is .
Replace all occurrences of with .
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