A) \[\cos \theta +i\,\,\sin \theta \]
B) \[\cos \theta -i\,\,\sin \theta \]
C) \[\cos \theta \pm i\,\,\sin \theta \]
D) \[\sin \theta \,\,\pm i\,\,\cos \theta \]
E) None of these
Correct Answer: C
Solution :
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