A) \[si{{n}^{2}}\theta +{{\cos }^{2}}\theta \]
B) \[si{{n}^{3}}\theta -{{\cos }^{3}}\theta \]
C) \[si{{n}^{4}}\theta +{{\cos }^{4}}\theta \]
D) \[si{{n}^{2}}\theta -{{\cos }^{2}}\theta \]
Correct Answer: D
Solution :
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