4/X^2-1=0

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Solution for 4/X^2-1=0 equation: 


D( X )

X^2 = 0

X^2 = 0

X^2 = 0

1*X^2 = 0 // : 1

X^2 = 0

X = 0

X in (-oo:0) U (0:+oo)

4/(X^2)-1 = 0

4*X^-2 = 1 // : 4

X^-2 = 1/4

-2 < 0

1/(X^2) = 1/4 // * X^2

1 = 1/4*X^2 // : 1/4

4 = X^2

X^2 = 4 // ^ 1/2

abs(X) = 2

X = 2 or X = -2

X in { 2, -2 }

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