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If f(x)={((1-cos x)/(x)",",x ne 0),(k","...

If `f(x)={((1-cos x)/(x)",",x ne 0),(k",",x=0):}` is continuous at x = 0, then the value of k is

A

0

B

`1/2`

C

`1/4`

D

`-1/2`

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