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I am trying to solve $x/sin(x) = a$ for $x$, where $a$ is a constant. But I can't seem to find a closed form solution for it.

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    $\begingroup$ Similar answer:math.stackexchange.com/questions/2317900/… Try numericaly: sol[a_] := NSolve[x/Sin[x] == a && -2 Pi < x < 2 Pi, x, Reals]; sol[2] $\endgroup$ – Mariusz Iwaniuk Jun 2 '18 at 7:20
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    $\begingroup$ This does not seem to be a question specific to Mathematica. $\endgroup$ – Daniel Lichtblau Jun 2 '18 at 13:48
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    $\begingroup$ Your equation is equivalent to the Kepler equation, which has no solutions in elemental functions $\endgroup$ – yarchik Jun 2 '18 at 14:40
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The function contains poles where sin[x]==0. As the function is a periodic function, many solutions exist for x/sin[x]==a. So, one has to solve these kinds of problems numerically. Please follow @Mariusz Iwaniuk with appropriate bounds for x based on requirement.

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