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#### Search: #### 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-expand-exponentialize

eq1:exponentialize(co...

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##### combine-display2d-expandwrt-false

display2d:false;

x1: a2*z1^2 + b2*z1 +c2;

y1: a1*z1^2 + b1*z1 +c1;

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##### combine-display2d-false

display2d:false;

combine(1/f/2*b+2*c/3...

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##### combine

1/( (l*q1+(1-l)*q2)+(...

combine(%);

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##### combine

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

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##### combine

eq1:n = -(- a *be...

combine (eq1);

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##### combine

eq1:(3-x)*(-1-x)*(-3-...

combine(eq1);

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##### combine-diff

eq1: f(x):=E*x/(1+x);

diff(f(x),x);

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

Calculate 