b: \(\sqrt{8-2\sqrt{15}}-\sqrt{5}\)
\(=\sqrt{5}-\sqrt{3}-\sqrt{5}\)
\(=-\sqrt{3}\)
c: \(\sqrt{11-6\sqrt{2}}=3-\sqrt{2}\)
d: \(\sqrt{5-2\sqrt{6}}=\sqrt{3}-\sqrt{2}\)
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