Tìm nghiệm của phương trình
\(\sin 5{\rm{x}} + {\rm{co}}{{\rm{s}}^2}{\rm{x}} - {\sin ^2}{\rm{x}} = 0\)
\(\left[ {\begin{array}{*{20}{l}}
{{\rm{x}} = - \frac{{\rm{\pi }}}{6} + {\rm{k}}\frac{{\rm{\pi }}}{3}}\\
{{\rm{x}} = - \frac{{\rm{\pi }}}{{14}} + {\rm{k}}\frac{{\rm{\pi }}}{7}}
\end{array}} \right.\)
\(\left[ {\begin{array}{*{20}{l}}
{{\rm{x}} = - \frac{{\rm{\pi }}}{6} + {\rm{k}}\frac{{{\rm{2\pi }}}}{3}}\\
{{\rm{x}} = - \frac{{\rm{\pi }}}{{14}} + {\rm{k}}\frac{{{\rm{2\pi }}}}{7}}
\end{array}} \right.\)
\(\left[ {\begin{array}{*{20}{l}}
{{\rm{x}} = \frac{{\rm{\pi }}}{6} + {\rm{k2\pi }}}\\
{{\rm{x}} = \frac{{\rm{\pi }}}{{14}} + {\rm{k2\pi }}}
\end{array}} \right.\)
