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Let f(x=sin""pi/x and D= { x : f (x) gt ...

Let `f(x=sin""pi/x` and `D= { x : f (x) gt 0}` , then D contains

A

`(1/3, 1/2)`

B

`(1/5, 1/4)`

C

`(-1, - 1/2)`

D

`( - pi, - 1/2)`

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The correct Answer is:
A, B, C
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