A) 2
B) 1
C) 3
D) 0
Correct Answer: A
Solution :
Since \[{{\cos }^{2}}\alpha +{{\cos }^{2}}\beta +{{\cos }^{2}}\gamma =1\]\[\,\Rightarrow \,\Sigma {{\sin }^{2}}\alpha =3-1=2\].You need to login to perform this action.
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