Question 249919
Multiply (x^r-y^f)(x^2r + y^2r) 
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= x^r(x^(2f) + y^2r) - y^f(x^(2f) + y^2r)
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= x^(r+2f) + y^(2r)*x^r - y^f*x^(2f) - y^(f+2r)
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Cheers,
Stan H.