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For `x in R ^(+), if x, [x], {x}` are in harmonic progesssion then the vaue of x can not be equal to :

A

`(1)/(sqrt2) tan ""pi/8`

B

` (1)/(sqrt2) cot ""pi/8`

C

`(1)/(sqrt2) tan ""(pi)/(12)`

D

`(1)/(sqrt2) cot ""(pi)/(12)`

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The correct Answer is:
A, C, D
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