Fermi

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These are answers submitted by Fermi

The problem is that the constant a can be anything in this case.

That's why you got to assume a as an integer first before simplify() (logically) works:

assume(a::integer);

-2*Pi*sin(Pi*a)/(-1+cos(2*Pi*a));
simplify(%);

Be aware that you're dividing  by zero  here.

 

Best Greetings

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