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If cosalpha+cosbeta+cosgamma=0=sinalpha+...

If `cosalpha+cosbeta+cosgamma=0=sinalpha+sinbeta+singamma,` then match the following.
`{:("I) "cos3alpha+cos3beta+cos3gamma=,"a) "0),("II) "sin2alpha+sin2beta+sin2gamma=,"b) "3),("III) "cos^2alpha+cos^2beta+cos^2gamma=,"c) "3//2),("IV) "cos(2alpha-beta-gamma)+cos(2beta-gamma-alpha)+cos(2gamma-alpha-beta)=,"d) "3cos(alpha+beta+gamma)):}`

A

A) d,a,c,b

B

B) b,c,a,d

C

C) d,a,b,c

D

D) d,c,b,a

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The correct Answer is:
A
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