The value of k (k lt 0) for which the fu...

The value of `k (k lt 0)` for which the function ? defined as
`f(x) ={((1-cos kx)/(x sin x),","x ne 0),((1)/(2),","x=0):}`
is continuous at ? = 0 is:

A

`+- 1`

B

`-1`

C

`+- 1/2`

D

`1/2`

Verified by Experts

The correct Answer is:

A

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