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Value of f(0) so that f(x) = (cos 2x-1)...

Value of f(0) so that f(x) = ` (cos 2x-1)/(sqrt(x^(2)+1)-1)` is continuous at x = 0 is

A

4

B

`-4`

C

`1/4`

D

`-1/4`

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The correct Answer is:
b
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