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5.25.11  Primitive part of a polynomial : primpart

primpart takes as argument a polynomial P given by a symbolic expression or by the list of its coefficients.
primpart returns the primitive part of P, that is P divided by the GCD (greatest common divisor) of its coefficients.
Input :

primpart(6x^2-3x+9)

or:

primpart([6,-3,9],x))

Output :

2*x^2-x+3

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