l=lim(x tending to zero) (a-sqrt(a^2-x^2)-x^2/4)|(x^4) if l is finite then a= i have supposed x=acostheta
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Could you write the question a little clearer?
What must a be in order that l be finite. The kind of standard thing to do would be to "rationalize" the numerator by multiplying both numerator and denominator by which gives Now take the limit as x goes to 0.
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