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Let L=lim(x rarr0)(a-sqrt(a^2-x^2)-x^2/4...

Let L=`lim_(x rarr0)(a-sqrt(a^2-x^2)-x^2/4)/x^4, a gt 0`. If L is finite, then

A

a=2

B

a=1

C

`a=4`

D

`a=3`

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