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Question

The fundamental period of the function f(x)=2cos 13(xπ) is

A
6 π
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B
4 π
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C
2 π
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D
π
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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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