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Let X=y=1 Z - 1 = z²== z²+1 = z {1+2z² + z⁴} / z² (Z²+1)² / | Algebra Quint

Let X=y=1

Z - 1 = z²== z²+1 = z

{1+2z² + z⁴} / z²

(Z²+1)² / z²

{Z/z}² = 1

Short way