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

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Solution for (-2t)/(1-t^2)-1=0 equation: 


D( t )

1-t^2 = 0

1-t^2 = 0

1-t^2 = 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)

(-2*t)/(1-t^2)-1 = 0

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

-1*(1-t^2)-2*t = 0

t^2-2*t-1 = 0

t^2-2*t-1 = 0

t^2-2*t-1 = 0

DELTA = (-2)^2-(-1*1*4)

DELTA = 8

DELTA > 0

t = (8^(1/2)+2)/(1*2) or t = (2-8^(1/2))/(1*2)

t = (2*2^(1/2)+2)/2 or t = (2-2*2^(1/2))/2

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

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

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

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

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

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

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

( t-((2-2*2^(1/2))/2) )

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

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

t in { (2*2^(1/2)+2)/2, (2-2*2^(1/2))/2 }

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