Find the coefficient of \( x^{2} \) in \( \left(\frac{a}{a+x}\right)^{1 / 2}+\left(\frac{a}{a-x}...

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Find the coefficient of \( x^{2} \) in \( \left(\frac{a}{a+x}\right)^{1 / 2}+\left(\frac{a}{a-x}\right)^{1 / 2} \).
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