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Question

The fundamental period of the function f(x)=2cos 13(xπ) is
  1. 6 π
  2. 4 π
  3. π
  4. 2 π


Solution

The correct option is A 6 π
f(x)=2cos (xπ3)=2 cos(2π+xπ3)
Period of f (x) = 2π13=6π

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