Solving an Integral without Symmetry: A Challenge

SeReNiTy
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I'm trying to solve a special integral.

\int{\frac{1}{1+[Tan(x)]^a}}dx

So far I've tried constructing a function F(a) and differentitating to show that it is a 0, hence any a would result in the same answer. Thus chose a = 2, and solve it quite easily. Although, all my arguments rely on symmetry, just wondering if it is possible to solve without symmetry.
 
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don't worry guys, I've worked it out
 
There are two things I don't understand about this problem. First, when finding the nth root of a number, there should in theory be n solutions. However, the formula produces n+1 roots. Here is how. The first root is simply ##\left(r\right)^{\left(\frac{1}{n}\right)}##. Then you multiply this first root by n additional expressions given by the formula, as you go through k=0,1,...n-1. So you end up with n+1 roots, which cannot be correct. Let me illustrate what I mean. For this...
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