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Prove that the angle between any two dia...

Prove that the angle between any two diagonals of a cube is `cos^-1frac{1}{3}`

A

`cos^-1(1/3)`

B

`30^@`

C

`cos^-1(1/sqrt3)`

D

`45^@`

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MODERN PUBLICATION-Three Dimensional Geometry-EXERCISE
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