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Evaluate: intcos 2 theta ln((cos theta+s...

Evaluate: `intcos 2 theta ln((cos theta+sin theta)/(cos theta-sin theta))d theta`

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To evaluate the integral \[ I = \int \cos(2\theta) \ln\left(\frac{\cos\theta + \sin\theta}{\cos\theta - \sin\theta}\right) d\theta, \] we will use integration by parts. ...
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