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Let f(x) =sin ({x})/(a) + cos ({x})/(a) ...

Let f(x) =sin `({x})/(a) + cos ({x})/(a)` where `a gt 0` and {.} denotes the fractional part function . Then find the set of values of 'a' for which f can attain its maximum values.

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The correct Answer is:
`(0,(4)/(pi))`
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