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5.34.8  Exact values of the complex rational roots of a polynomial: crationalroot

crationalroot takes 1 or 3 arguments: a polynomial and optionally 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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