Use multiplication or division of power series to find the first 3 non-zero terms in the Maclaurin series for:

I multiplied and got:

which is not right in webassign. Should I have divided? Or what am I doing wrong?

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- April 16th 2009, 04:34 PMmollymcf2009Multiplying/Dividing Power Series
Use multiplication or division of power series to find the first 3 non-zero terms in the Maclaurin series for:

I multiplied and got:

which is not right in webassign. Should I have divided? Or what am I doing wrong? - April 16th 2009, 05:13 PMskeeter
looks like a mistake in your expansion for ... forget the factorial?

- April 16th 2009, 05:33 PMCalculus26
in your expansion for cos(4x) the coefficient for the x^4 term should be 32/3

your method is correct