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