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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.

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]

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