If a line makes angles alpha,beta,gamma ...

If a line makes angles `alpha,beta,gamma` with co-ordinate axes, then `cos2alpha+cos 2 beta+cos2gamma=` a)`-2` b)`-1` c)`1` d)`2`

A

`-2`

B

`-1`

C

1

D

2

Verified by Experts

The correct Answer is:

B

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