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A line makes angles `alpha,beta,gammaa n ddelta` with the diagonals of a cube. Show that `cos^2alpha+cos^2beta+cos^2gamma+cos^2delta=4//3.`

A

`(1)/(2)`

B

`(1)/(4)`

C

`(3)/(4)`

D

`(4)/(3)`

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The correct Answer is:
D
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