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Let L=lim(x->0)(a-sqrt(a^2-x^2)-(x^2)/4...

Let `L=lim_(x->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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