-- Global variable: facsum_combine Default value:
facsum_combine controls the form of the final result returned by
facsum when its argument is a quotient of polynomials. If
false then the form will be returned as a fully expanded sum as described above, but if
true, then the expression returned is a ratio of polynomials, with each polynomial in the form described above.
true setting of this switch is useful when one wants to
facsum both the numerator and denominator of a rational expression, but does not want the denominator to be multiplied through the terms of the numerator.
(%o1) true (%i2)
x1: a2*z1^2 + b2*z1 +c2;
y1: a1*z1^2 + b1*z1 +c1;