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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

discontinuous at `x= n pi + pi//4`

B

continuous at `x= n pi + pi//4`

C

discontinuous at all x

D

none of these

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The correct Answer is:
B
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