A) \[\frac{2{{\cos }^{2}}\beta }{1+{{\cos }^{2}}\beta }\]
B) \[\frac{2{{\cos }^{2}}\gamma }{1+{{\cos }^{2}}\gamma }\]
C) \[\frac{2{{\cos }^{2}}\alpha }{1+{{\cos }^{2}}\alpha }\]
D) \[\frac{\cos (\alpha +\beta )}{{{\cos }^{2}}\gamma }\]
Correct Answer: C
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