A line makes an angle of alpha,beta,gamma,delta with the four diagonals of a cube then the value of [cos^2alpha + cos

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Q 2149834713.     A line makes an angle of alpha,beta,gamma,delta with the four diagonals of a cube then the value of [cos^2alpha + cos^2 beta + cos^2 gamma + cos^2 delta] is (where [.]` denote the GIF)

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