If line makes angle `alpha, beta, gamma, delta` with four diagonals of a cube, then the value of

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If line makes angle `alpha, beta, gamma, delta` with four diagonals of a cube, then the value of `sin^2alpha+sin^2beta+sin^2gamma+sin^2delta` is (A) `4/` (B) `1` (C) `8/3` (D) `7/3`
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