clear all y=(a/2)^2/b/4 l=f*(b-y)+z*(a-f) m=2*(b-y)-a+f n=2*(b-y)+a-f o=l*(1/m-1/n)/2 elim l m n y simp copy f simp symb 6 deri z f simp symb simp symb
distrib
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Mandriva
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