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If cosx + cosy + cosz = 0 "and" sinx + s...

`If cosx + cosy + cosz = 0 "and" sinx + siny + sinz =0, "then show that"`
`cos (x-y) + cos(y - z) + cos(z - x) = - 3/2.`

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`

Text Solution

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The correct Answer is:
B, D
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VK JAISWAL-COMPOUND ANGLES-Exercise-2 : One or More than One Answer is/are Correct
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  9. If alpha=sin x cos^(3) x and beta=cos x sin^(3) x, then :

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  16. The value of (sin x-cos x)/(sin^(3)x) is equal to :

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