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2.28.8  Integer and fractional part : propfrac

propfrac takes as argument a rational fraction.
propfrac rewrites this rational fraction as the sum of it’s integer part and proper fractional part.
propfrac(A(x)/B(x)) writes the fraction A(x)/B(x) (after reduction), as :

Q(x)+
R(x)
B(x)
      where  R(x)=0  or  0≤ degree(R(x))< degree(B(x)) 

Input :

propfrac((5*x+3)*(x-1)/(x+2))

Output :

5*x-12+21/(x+2)

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