### The Maxima on-line user's manual

Algebra Calculator

#### Facsum_combine

-- Global variable: facsum_combine Default value: `true`

`facsum_combine` controls the form of the final result returned by `facsum` when its argument is a quotient of polynomials. If `facsum_combine` is `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.

The `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) ```

### Related Examples

##### combine-factor

c:1*f/2*b + 2*c/3*a +...

c;

combine(c);

Calculate

##### combine

combine(4*x-6*x+5);

Calculate

##### combine-is-sqrt

a: -3/10 + sqrt(141)/30;

c: combine(a);

b: (-9+sqrt(141))/30;

Calculate

##### combine

x^2/(1+x)+2*x/(1+x);

combine(o1%);

Calculate

##### combine-display2d-expand-false

display2d:false;

e:+x0^4*(y1-y2)+x0*x1...

e1:-(x1*(-x0^4*y2+x2^...

Calculate

##### combine-factor

a:(sy*sx-sxy*s)/(sx^2...

b:-(sxx*sy-sxy*sx)/(s...

f:syy+a^2*s+b^2*sxx-2...

Calculate

##### combine-diff-display2d-false-first-plot2d-second-solve-third

display2d:false;

Q(t):=a + b*t + c*t*t;

I(t):=''(diff(Q(t), t));

Calculate

##### combine-diff-expand-simp-true

simp:true;

J2:1/6*((sigma_xx-sig...

combine(expand(diff(J...

Calculate

##### combine

ax : cx1 - cx2 + ax1*...

ay : cy1 - cy2 + ay1*...

az : cz1 - cz2 + az1*...

Calculate

##### combine-expand-ratsimp

eq1: 1/(a+b*c)+1/(b+a...

combine( eq1);

ratsimp(eq1);

Calculate