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Which of the following function is perio...

Which of the following function is periodic ?

A

`sgn(e^(-x)) x gt 0`

B

`|sin x| + sinx`

C

`min (4 cos x, |x|)`

D

`[x+(1)/(2)] + [x-(1)/(2)]+2[-x]`, [.] represents greatest integral function

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The correct Answer is:
A, B, D
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