1.

If2(cos(x-y)+cos(y-z)+cos(z-x))=-3, then :

Answer»

`COS X cos ycosz=1`
`cos x+COSY+cos z=0`
`sinx+siny+sinz=1`
`cos 3x+cos3y+cos3z=12 cosx cosy cosz`

Answer :B::D


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