 
 
 
2.29.4  Exact values of the complex rational roots of a polynomial : crationalroot
crationalroot takes 1 or 3 arguments : a polynomial and 
optionnally two complex numbers α,β.
- 
If crationalroot has 1 argument, crationalroot returns the 
list of the complex rational roots of the 
polynomial without multiplicity.
- if crationalroot has 3 arguments, crationalroot returns only
the complex rational roots of the 
polynomial which are in the rectangle with sides parallel to the 
axis having [α,β] as opposite vertices.
To find the rational complex roots of 
(x2+4)*(2x−3)=2*x3−3*x2+8*x−12, input :
crationalroot(2*x^3-3*x^2+8*x-12)
Output :
[2*i,3/2,-2*i]
 
 
