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Let [x] denote the greatest integer less than or equal to x Then the value of a for which the function `f(x)={((sin[-x^(2)])/([-x^(2)])",",xne0),(alpha",",x=0):}` is continuous at x=0 is

A

`alpha=0`

B

`alpha=sin(-1)`

C

`alpha=sin(1)`

D

`alpha=1`

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