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Select the write the most appropriate answer from the given alternatives in each of the following :
If f (x) is continuous at `x=0,` where
`{:(f(x)=(3^(x)-3^(-x))/(sin x)",","for" x ne0),(=k",","for"x=0.):}`
then the value of k is

A

0

B

log 3

C

`(log3)^(2)`

D

`log9.`

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