Question

$\sqrt{33 + \sqrt{13 - \sqrt{21 - \sqrt{25} } } }$
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Answer 1

$\sqrt{33+\sqrt{13-\sqrt{21-\sqrt{25}}}}=\\\sqrt{33+\sqrt{13-\sqrt{21-5}}}=\\\sqrt{33+\sqrt{13-\sqrt{16}}}=\\\sqrt{33+\sqrt{13-4}}=\\\sqrt{33+\sqrt9}=\\\sqrt{33+3}=\\\sqrt{36}=\\6$