If f(x)={(sin x;x rational) (cos x;x is ...

If `f(x)={(sin x;x` rational) `(cos x;x` is irrational) then the function is

A

`x= n pi + pi //4, n in I`

B

`x= n pi + pi //8, n in I`

C

`x= n pi + pi //6, n in I`

D

`x= n pi + pi //3, n in I`

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The correct Answer is:

A

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