A) \[\pi /6\]
B) \[\pi /4\]
C) \[\pi /3\]
D) \[\pi /2\]
Correct Answer: B
Solution :
The given condition gives, \[\frac{5+5{{\cos }^{2}}\alpha }{5}=3.\frac{25-25{{\cos }^{2}}\alpha }{25}\] \[\Rightarrow \] \[{{\cos }^{2}}\alpha =\frac{1}{2}\Rightarrow \alpha =\frac{\pi }{4},\frac{3\pi }{4}\]You need to login to perform this action.
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