1985 OIM Problems/Problem 4
Problem
If 
, 
, 
, and:
![\[\frac{yz-x^2}{1-x}=\frac{xz-y^2}{1-y}\]](http://latex.artofproblemsolving.com/d/1/7/d17d18b9b486581e704fdcc8624cdc663b7e8c64.png)
Prove that both fractions are equal to 
.
~translated into English by Tomas Diaz. ~orders@tomasdiaz.com
Solution
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