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I only see numerical approaches to solve this equation. Is there an analytical solution to solve $x$ as a function of $y$ for the range $(0,2 \pi)$? If there is no solution, is it possible to proof it?

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    What do you mean by 'solve'? Are you trying to find zeroes?2012-06-07
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    I would be extremely surprised if there were.2012-06-07
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    @JoeJohnson126: My guess is that he wants to solve for $x$ as a function of $y$.2012-06-07
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    @ Harald Hanche-Olsen: thats right2012-06-07
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    Probably no solution in elementary functions. See, for example, Kepler's equation which is known to have no solution in elementary functions: http://en.wikipedia.org/wiki/Kepler's_equation2012-06-07
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    out of curiosity, what is it for? Is it Newton's method or something? I'm only asking because there are contexts (like Newton's method) where you don't need one to solve the problem.2012-06-07

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