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X1 x2. X2/x-1=1/x-1. (1-2x)(2+x)+(1-x)(2-2x). (X-2)^2-(X-1)(X+2). X1^2+x2^2.
X2/x-1=1/x-1. (1-2x)(2+x)+(1-x)(2-2x). (X-2)^2-(X-1)(X+2). X1^2+x2^2.

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