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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- Jan 2nd 2010, 08:48 AMdhiabPower series expansion
**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** - Jan 2nd 2010, 09:15 AMAbu-Khalil
$\displaystyle \sin 4x\cos 2x=\frac{1}{2}\left(\sin 6x+\cos 2x\right)$

And then u may use de power series you know.