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If function f (alpha ) = {{:((1 - cos 6 ...

If function `f (alpha ) = {{:((1 - cos 6 alpha )/(36 alpha ^(2)) if alpha ne 0),(k if alpha = 0):}` is continuous at `alpha =0 `then k = _______________.

A

`- (1)/(2)`

B

`1`

C

`(1)/(2)`

D

0

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