(X^2-1)/(X-1)

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Solution for (X^2-1)/(X-1) equation: 


D( X )

X-1 = 0

X-1 = 0

X-1 = 0

X-1 = 0 // + 1

X = 1

X in (-oo:1) U (1:+oo)

(X^2-1)/(X-1) = 0

1*X^2 = 1 // : 1

X^2 = 1

X^2 = 1 // ^ 1/2

abs(X) = 1

X = 1 or X = -1

X in { 1} 

X = -1

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