[tex]\displaystyle\bf\\\sqrt[4]{7-\sqrt{33} } \cdot\sqrt[4]{7+\sqrt{33} } =\sqrt[4]{(7-\sqrt{33})\cdot(7+\sqrt{33} ) } =\\\\\\=\sqrt[4]{7^{2} -(\sqrt{33} )^{2} } =\sqrt[4]{49-33} =\sqrt[4]{16} =\sqrt[4]{2^{4} } =2\\\\\\Otvet \ : \ 2[/tex]