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[" (C) "|z(2)-z(1),bar(z)(2)-bar(z)(1)|]...

[" (C) "|z_(2)-z_(1),bar(z)_(2)-bar(z)_(1)|],[" Let "z=cos theta+i sin theta" .Then the value of "sum_(m=1)^(15)lm(z^(2m-1))" at "theta=2^(@)" is "]

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