Sum[(Pi - ((1 + 2*k)*Pi)/(2*n))*Sin[((1 + 2*k)*m*Pi)/(2*n)],{k,0,n-1}]Sum[(Pi - ((1 + 2*k)*Pi)/(2*n))*Sin[((1 + 2*k)*m*Pi)/(2*n)],{k,0,n-1}]

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