[Maxima] caps complex tests

[Richard Hennessy]

I guess, under the interpretation that sqrt(x^2) = x then this answer is 
right.

integrate(sqrt(x^2-2*a*x+a^2)*sqrt(x^2-2*b*x+b^2),x);
-> (2*x^3+(-3*b-3*a)*x^2+6*a*b*x)/6

according to the interpretation that sqrt(x^2) = abs(x) then this answer is 
right.

abs(x-a)*((x-b)*(2*x+b-3*a)*abs(x-b)+(b-a)^2*abs(b-a))/(6*(x-a))

That’s all I have to say about that.

Rich