The answer in the back of the book is just one of many possible forms for
the answer.
Two equally correct answers to an integration problem may differ by a
constant.
> The problem is that the book give:
> F(x)=-1/3*cos(x)^3 + 2/5*cos(x)^5 - 1/7*cos(x)^7 + C
>
> which is very different from Maxima result (%o61)
>
> So where is the true?
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