1/(s^2-1)

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


D( s )

s^2-1 = 0

s^2-1 = 0

s^2-1 = 0

1*s^2 = 1 // : 1

s^2 = 1

s^2 = 1 // ^ 1/2

abs(s) = 1

s = 1 or s = -1

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

1/(s^2-1) = 0

s belongs to the empty set

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