1.

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

Answer»

`sin^(2)alpha + sin^(2)BETA + sin^(2)GAMMA = 3/2`
`sin^(2)alpha+ sin^(2)beta+ sin^(2)gamma =3/4`
`cos^(2)alpha + cos^(2)beta + cos^(2)gamma =3/2`
`cos2alpha + cos2beta + cos2gamma =-1`

ANSWER :A::C


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