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Trignometry

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5 Apr 2008 10:59:07 IST

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if cosA+cosB+cosC = sinA+sinB+sinC = 0 then cos3A+cos3B+cos3C=?

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Hari Shankar

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Joined: 28 Feb 2007

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5 Apr 2008 11:11:48 IST

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Hint: $z_1 = \cos{A} + i\sin A$ etc.

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