simplifying with maple

Question:simplifying with maple

Posted: Lonely 400 Product: Maple

February 20 2009

please help me here. I want to simplify the expression:

(-f(xn)^2*f(zn)+f(xn)^2*(D(f))(zn)*zn+f(xn)*f(zn)^2-2*f(xn)*f(zn)*(D(f))(zn)*zn+(D(f))(zn)*xn*f(zn)^2)/((D(f))(zn)*(f(zn)^2+f(xn)^2-2*f(xn)*f(zn)))

I just compied it directly from maple

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