A) \[2\text{ si}{{\text{n}}^{-}}^{1}\left( n/2 \right)~\]
B) \[2\text{ }co{{s}^{-}}^{1}\left( n/2 \right)\]
C) \[co{{s}^{-}}^{1}\left( n/2 \right)\]
D) \[si{{n}^{-}}^{1}\left( n/2 \right)\]
Correct Answer: B
Solution :
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