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Assuming there's not a typo in your question, it's doing exactly what it should, meaning perhaps your equation or its entry is incorrect. Using a simplify wrapper: fs[a_] := FullSimplify[a, 0 < r < 1 && r ∈ Reals] I applied it to the blocks of your equation as follows: s1 = fs[4* Pi*(-(r*(1 + r)^2* Sqrt[-(((1 + r)^4 + (-1 + ...
My problem was solved by Wolfram support. Apparently there was some corruption in one or more Mathematica files. We solved the problem by deleting the following folders (Windows 7, 64 bit): C:\ProgramData\Mathematica C:\Users\mkaplan\AppData\Roaming\Mathematica When I then ran Mathematica, it recreated these folders and the error went away.
I experienced the same error today, and solved it by following the instructions in the link that @VLC posted. I validated my Fonts, reinstalled Mathematica, and started the app with clean prefs. None of those steps solved the problem on their own, but after a restart everything was back to normal. So, possibly not all of the steps were required.
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