Q .     If `f(x) = { tt ( ( (1-cos 4x)/x^2 , text (when) x < 0 ), (a, text (when) x=0), ( (sqrt(x))/(sqrt(16+sqrt(x))) -4 , text (when) x > 0) ) ` is

continuous at `x = 0`, then the value of a will be

UPSEE 2012
A

`8`

B

`-8`

C

`4`

D

None of these

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