This function : $\displaystyle f\left( x \right) = \sin \left( {4x} \right)\cos \left( {2x} \right)$ have is the Power series expansion? Give the radius and int of convergence
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$\displaystyle \sin 4x\cos 2x=\frac{1}{2}\left(\sin 6x+\cos 2x\right)$ And then u may use de power series you know.
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