Question
Decide on what substitution to use, and then evaluate the given integral using a substitution. HINT [See Example 1.]$$\int \frac{e^{x}-e^{-x}}{e^{x}+e^{-x}} d x$$
Step 1
So, we can make a substitution $u = e^{x} + e^{-x}$. Show more…
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