A) \[\sqrt{1+{{\cos }^{2}}\alpha }\]
B) \[\sqrt{1+{{\sin }^{2}}\alpha }\]
C) \[\sqrt{2+{{\sin }^{2}}\alpha }\]
D) \[\sqrt{2+{{\cos }^{2}}\alpha }\]
E) None of these
Correct Answer: D
Solution :
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