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

If a line makes `alpha,beta,gamma,delta` angles with four diagonals of a cube, then
`cos2alpha+cos2beta+cos2gamma+cos2delta`=

A

`-(2)/(3)`

B

`(2)/(3)`

C

`-(4)/(3)`

D

`(4)/(3)`

Verified by Experts

The correct Answer is:

C

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