question_answer

If a line makes angles \[\alpha ,\] \[\beta ,\] \[\gamma ,\] \[\delta \] with the four diagonals of a cube, then the value of \[{{\cos }^{2}}\alpha +{{\cos }^{2}}\beta +{{\cos }^{2}}\gamma +{{\cos }^{2}}\delta =\]

A)  1                                

B)  \[\frac{4}{3}\]

C)  2                                

D)  Zero

E)  None of these