Evaluate: \( \lim _{x \rightarrow 0} \frac{\sqrt{5+x}-\sqrt{5-x}}{\sqrt{10+x}-\sqrt{10-x}} \).
Evaluate: \( \lim _{x \rightarrow 0} \frac{\sqrt{5+x}-\sqrt{5-x}}{\sqrt{10+x}-\sqrt{10-x}} \).
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