A) \[{{\sin }^{2}}A-{{\sin }^{2}}B\]
B) \[{{\cos }^{2}}A-{{\sin }^{2}}B\]
C) \[{{\cos }^{2}}A-{{\cos }^{2}}B\]
D) \[\cos 2A\,\,.\,\,\cos 2B\]
Correct Answer: B
Solution :
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