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Let A and B denote the statements A : ...

Let `A and B` denote the statements
`A : cos alpha + cos beta + cos gamma =0`
`B : sin alpha + sin beta + sin gamma = 0`
If `cos(beta - gamma) + cos (gamma -alpha) + cos (alpha -beta) = - (3)/(2)`,
then

A

`Sigma cos alpha=0`

B

`Sigma sin alpha=0`

C

`Sigma cos alpha sin alpha=0`

D

`Sigma(cos alpha + sin alpha)=0`

Text Solution

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The correct Answer is:
A, B, D
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