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If 2(cos(x-y)+cos(y-z)+cos(z-x))=-3, th...

If `2(cos(x-y)+cos(y-z)+cos(z-x))=-3`, then :

A

`cos x cos ycosz=1`

B

`cos x+cosy+cos z=0`

C

`sinx+siny+sinz=1`

D

`cos 3x+cos3y+cos3z=12 cosx cosy cosz`

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B, D
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VIKAS GUPTA (BLACK BOOK) ENGLISH-COMPOUND ANGLES-Exercise-2 : One or More than One Answer is/are Correct
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