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If f(x) = {x} + sin ax (where {.} denote...

If f(x) = {x} + sin ax (where {.} denotes the fractional part function) is periodic then

A

a' is a rational multiple of `pi`

B

a' is a natural number

C

a' is any real number

D

a' is any positive real number

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The correct Answer is:
A
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