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If f(x)={(log((1-3x))(1+3x)",","for",x n...

If `f(x)={(log_((1-3x))(1+3x)",","for",x ne 0),(k",","for",x =0):}` is continuous at x = 0, then k is equal to

A

-1

B

1

C

3

D

-3

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A
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