(t+9)/(t^2-1)

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Solution for (t+9)/(t^2-1) equation: 


D( t )

t^2-1 = 0

t^2-1 = 0

t^2-1 = 0

1*t^2 = 1 // : 1

t^2 = 1

t^2 = 1 // ^ 1/2

abs(t) = 1

t = 1 or t = -1

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

(t+9)/(t^2-1) = 0

t+9 = 0 // - 9

t = -9

t = -9

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