A) \[\{n\pi :n\in I\}\]
B) \[\{2n\pi :n\in I\}\]
C) \[\{n\pi /2:n\in I\}\]
D) \[\{n\pi /3:n\in I\}\]
Correct Answer: B
Solution :
Since, \[\cos \,{{0}^{o}}=1,\,\cos \,\,{{360}^{o}}=1,......\] \[\therefore \] Set of all local maxima for \[y=\cos \,x\] is \[\{2n\pi :n\,\in I\}\].
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