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

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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