A) \[\cos \,\,(\alpha +\beta +\gamma +\delta )\]
B) \[2\cos \,\,(\alpha +\beta +\gamma +\delta )\]
C) \[4\cos \,\,(\alpha +\beta +\gamma +\delta )\]
D) \[\cos \,\,(\alpha +\beta +\gamma +\delta )+i\,\,sin\,\,(\alpha +\beta +\gamma +\delta )\]
E) None of these
Correct Answer: B
Solution :
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