4/t^2-1

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Solution for 4/t^2-1 equation: 


D( t )

t^2 = 0

t^2 = 0

t^2 = 0

1*t^2 = 0 // : 1

t^2 = 0

t = 0

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

4/(t^2)-1 = 0

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

t^-2 = 1/4

-2 < 0

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

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

4 = t^2

t^2 = 4 // ^ 1/2

abs(t) = 2

t = 2 or t = -2

t in { 2, -2 }

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