If cos α, cos β, cos γ are the direction cosines of a vector a,then cos 2α + cos 2β + cos 2γ is equal to
(1) 3
(2) 0
(3) 2
(4) -1
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If cos α, cos β, cos γ are the direction cosines of a vector a,then cos 2α + cos 2β + cos 2γ is equal to
(1) 3
(2) 0
(3) 2
(4) -1
If cos α, cos β, cos γ are the direction cosines of a vector a,then cos 2α + cos 2β + cos 2γ is equal to
(1) 3
(2) 0
(3) 2
(4) -1
The Correct option is (4) -1