32.
\(sin^4x=\left(sin^2x\right)^2=\left(\dfrac{1-cos2x}{2}\right)^2=\dfrac{1}{4}-\dfrac{1}{2}cos2x+\dfrac{1}{4}cos^22x\)
\(\)\(=\dfrac{1}{4}-\dfrac{1}{2}cos2x+\dfrac{1}{4}\left(\dfrac{1}{2}+\dfrac{1}{2}cos4x\right)\)
\(=\dfrac{3}{8}-\dfrac{1}{2}cos2x+\dfrac{1}{8}cos4x\)
\(a+b+2c=\dfrac{3}{8}-\dfrac{1}{2}+2.\left(\dfrac{1}{8}\right)=\dfrac{1}{8}\)
33.
\(\Leftrightarrow\left\{{}\begin{matrix}m>0\\\Delta=m^2-4m< 0\end{matrix}\right.\) \(\Leftrightarrow\left\{{}\begin{matrix}m>0\\0< m< 4\end{matrix}\right.\)
\(\Rightarrow m=\left\{1;2;3\right\}\) có 3 giá trị
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