question_answer

If a line makes \[\alpha ,\beta ,\gamma \] with the positive direction of \[x,\ y\] and z-axis respectively. Then, \[{{\cos }^{2}}\alpha +{{\cos }^{2}}\beta +{{\cos }^{2}}\gamma \] is [Orissa JEE 2002]

A)            ½

B)            ?1/2

C)            ?1

D)            1