Toán Lớp 10: Giải phương trình:
1) cos2x= -cos3x
2) sin2x= -sin3x
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Toán Lớp 10: Giải phương trình:
1) cos2x= -cos3x
2) sin2x= -sin3x
Comments ( 1 )
2 x = π – 3 x + 2 πn
\\
2 x = -π + 3 x + 2 π n
\end{array} \right.\) (n\in mathbbZ)
5x=2 π n + π
\\
-x = -π + 2 π n
\end{array} \right.\) (n\in mathbbZ)
x=\frac{2 π n}{5} + \frac{π}{5}
\\
x = π – 2 π n
\end{array} \right.\) (n\in mathbbZ)
2 x = π + 3 x + 2 π n
\\
2 x = 2 π n – 3 x
\end{array} \right.\) (n\in mathbbZ)
-x = 2 π n + π
\\
5 x = 2 π n
\end{array} \right.\) (n\in mathbbZ)
x = -2 π n – π
\\
x = \frac{2 π n}{5}
\end{array} \right.\) (n\in mathbbZ)