If a line makes the angle \[\alpha ,\beta ,\gamma \] with three dimensional co-ordinate axes respectively, then \[\cos 2\alpha +\cos 2\beta +\cos 2\gamma =\] [MP PET 1994, 95,99; RPET 2003; Kerala (Engg.) 2005]

If a line makes the angle \[\alpha ,\beta ,\gamma \] with three dimens

1.	If a line makes the angle \[\alpha ,\beta ,\gamma \] with three dimensional co-ordinate axes respectively, then \[\cos 2\alpha +\cos 2\beta +\cos 2\gamma =\] [MP PET 1994, 95,99; RPET 2003; Kerala (Engg.) 2005]
A.	? 2
B.	? 1
C.	1
D.	2
Answer» C. 1

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If a line makes the angle \[\alpha ,\beta ,\gamma \] with three dimensional co-ordinate axes respectively, then \[\cos 2\alpha +\cos 2\beta +\cos 2\gamma =\] [MP PET 1994, 95,99; RPET 2003; Kerala (Engg.) 2005]

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