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approximate (\int_0^(-2*pi) (exp(exp(x*i)) -3)/(exp(exp(x*i))-3*exp(x*i)-1)dx)*2/(pi)
approximate (\int_0^(-2*pi) (exp(exp(x*i)) -3)/(exp(exp(x*i))-3*exp(x*i)-1)dx)*2/(pi)
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