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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