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If cos A+ cos B + cos C =0 then cos 3A+ ...

If `cos A+ cos B + cos C =0` then `cos 3A+ cos 3B + cos 3X`

A

`4 cos 3 A cos 3B cos 3C`

B

`12 cos A cos B cos C`

C

`8 cos A cos B cos C`

D

`10 cos A cos B cos C`

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B
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