1.

If cosalpha+cosbeta+cosgamma=sinalpha+sinbeta+singamma=0, then

Answer»

`cos2alpha+cos2beta+cos2gamma=0`
`sin2alpha+sin2beta+sin2gamma=0`
`cos(beta+gamma)+cos(gamma+alpha)+cos(alpha+beta)=0`
`SIN(beta+gamma)+sin(gamma+alpha)+sin(alpha+beta)=0`

Answer :A::B::C::D


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