Simplify between 2(l^2 + x^2)^1/2 - 2l and 2l[(1+x^2/l^2)^1/2 - 1]
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Simplify between 2(l^2 + x^2)^1/2 - 2l and 2l[(1+x^2/l^2)^1/2 - 1]
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