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Let L = lim(x rarr 0) ( a - sqrt( a^2 - ...

Let L = `lim_(x rarr 0) ( a - sqrt( a^2 - x^2) - x^2/4)/x^4`, a>0.If L is finite, then

A

`a=2`

B

`a=1`

C

`L=1/64`

D

`L=1/32`

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