Question
Evaluate the following limits:
$\lim _{y \rightarrow 0}\left[\frac{\sqrt{1-y^2}-\sqrt{1+y^2}}{y^2}\right]$
$\lim _{y \rightarrow 0}\left[\frac{\sqrt{1-y^2}-\sqrt{1+y^2}}{y^2}\right]$
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