My maxima (5.19.2) also generates an error here.

On Nov 8, 8:24 am, pong <[email protected]> wrote:
> I have encountered a problem in using integral
>
> integral(x * sqrt((-2*cos(x))^2 + (2*sin(x))^2), x, 0, pi)
>
> correctly gives pi^2
>
> but
>
> integral(sin(x) * sqrt((-2*cos(x))^2 + (2*sin(x))^2), x, 0, pi)
>
> results in a complaint that Maxima encountered a Lisp error: 2 is not
> of the type LIST.
>
> Why so? Any help?
>
> Thanks in advance

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