### 2.12.7 Multiplication by the conjugate quantity :
`mult_conjugate`

`mult_conjugate` takes as argument an expression with a denominator or a numerator supposed to contain a square root :

- if the denominator contains a square root,
  `mult_conjugate` multiplies the numerator and the denominator of the expression by the conjugate quantity of the denominator.
- otherwise, if the numerator contains a square root,
  `mult_conjugate` multiplies the numerator and the denominator of this expression by the conjugate quantity of the numerator.

Input :

`mult_conjugate((2+sqrt(2))/(2+sqrt(3)))`

Output :

`(2+sqrt(2))*(2-sqrt(3))/((2+sqrt(3))*(2-sqrt(3)))`

Input :

`mult_conjugate((2+sqrt(2))/(sqrt(2)+sqrt(3)))`

Output :

`(2+sqrt(2))*(-sqrt(2)+sqrt(3))/`
`((sqrt(2)+sqrt(3))*(-sqrt(2)+sqrt(3)))`

Input :

`mult_conjugate((2+sqrt(2))/2)`

Output :

`(2+sqrt(2))*(2-sqrt(2))/(2*(2-sqrt(2)))`