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