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If cosA+cosB+cosC=sinA+sinB+sinC=0 then prove that: cos3A+cos3B+cos3C=3cos(A+B+C).?

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  • If cosA+cosB+cosC=sinA+sinB+sinC=0 then prove that: cos3A+cos3B+cos3C=3cos(A+B+C).?


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