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I am having some difficulties with the calculation of the following integral. Can somebody help me please?

$$\int \frac{dx}{1+a\cos x},\text{ for }0

Thank you in advance

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    How many times are you going to ask the same question?2012-11-07
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    It is not the same question. It is another exercise..2012-11-07
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    It's the same basic integral rewritten. You've now had 3 people give you the same answer on 3 separate questions.2012-11-07

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