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Giải các phương trình :
$\begin{array}{l}
1)\,\,\,{3^{\left| {\sin \sqrt x } \right|}} = \left| {\cos x} \right|\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,(1)\\
2)\,\,{\log _2}\left( {co{s^2}xy + \frac{1}{{co{s^2}xy}}} \right) = \frac{1}{{{y^2} - 2y + 2}}\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,(2)\end{array}$
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