Three Dimensional Geometry Question 137
Question: If $ \alpha ,\beta ,\gamma $ be the angles which a line makes with the co-ordinate axes, then
[MP PET 2002; Orissa JEE 2002]
Options:
A) $ {{\sin }^{2}}\alpha +{{\cos }^{2}}\beta +{{\sin }^{2}}\gamma =1 $
B) $ {{\cos }^{2}}\alpha +{{\cos }^{2}}\beta +{{\cos }^{2}}\gamma =1 $
C) $ {{\sin }^{2}}\alpha +{{\sin }^{2}}\beta +{{\sin }^{2}}\gamma =1 $
D) $ {{\cos }^{2}}\alpha +{{\cos }^{2}}\beta +{{\sin }^{2}}\gamma =1 $
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Answer:
Correct Answer: B
Solution:
It is obvious.
BETA
