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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looks like a mistake in your expansion for ... forget the factorial?
in your expansion for cos(4x) the coefficient for the x^4 term should be 32/3
your method is correct
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