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Math Help - Power series expansion

  1. #1
    Super Member dhiab's Avatar
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    Power series expansion

    This function :

    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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  2. #2
    Member Abu-Khalil's Avatar
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    \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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