$83-94$ Evaluate the integral. $$\int\left(e^{x}+e^{-x}\right)^{2} d x$$
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Step 1:** Apply the identity $(a + b)^2 = a^2 + b^2 + 2ab$ to the given integral: $$\int\left(e^{x}+e^{-x}\right)^{2} dx = \int\left(e^{2x} + e^{-2x} + 2\right) dx$$ ** Show more…
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