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If sinalpha+sinbeta+singamma=cosalpha+co...

If `sinalpha+sinbeta+singamma=cosalpha+cosbeta+cosgamma=0`then prove that
`cos3alpha+cos3beta+cos3gamma=3cos(alpha+beta+gamma)`

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If sinalpha+sinbeta+singamma=cosalpha+cosbeta+cosgamma=0, then (A) cos3alpha+cos3beta+cos3gamma=3cos(alpha+beta+gamma) (B) cos 3alpha+cos3beta+cos3gamma=0 (C) sin3alpha+sin3beta+sin3gamma=0 (D) sin3alpha+sin3beta+sin3gamma= 3sin(alpha+beta+gamma)

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