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Let cos A + cos B + cos C = 0 and sin A ...

Let `cos A + cos B + cos C = 0` and `sin A + sin B + sin C = 0` then which of the following statement(s) is/are correct?

A

` sum cos ( 2A -B-C) =3`

B

`sum cos (2A -B-C)=0`

C

`sum sin ( 2A -B-C)=0`

D

`sum (2 A -B-C)=3`

Text Solution

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The correct Answer is:
A, C
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