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D( t )
4*t = 0
4*t = 0
4*t = 0
4*t = 0 // : 4
t = 0
t in (-oo:0) U (0:+oo)
2-t = 5-(3/(4*t)) // - 5-(3/(4*t))
3/(4*t)-t-5+2 = 0
3/4*t^-1-1*t^1-3*t^0 = 0
(3/4*t^0-1*t^2-3*t^1)/(t^1) = 0 // * t^2
t^1*(3/4*t^0-1*t^2-3*t^1) = 0
t^1
3/4-t^2-3*t = 0
3/4-t^2-3*t = 0
DELTA = (-3)^2-(-1*4*(3/4))
DELTA = 12
DELTA > 0
t = (12^(1/2)+3)/(-1*2) or t = (3-12^(1/2))/(-1*2)
t = (2*3^(1/2)+3)/(-2) or t = (3-2*3^(1/2))/(-2)
t in { (2*3^(1/2)+3)/(-2), (3-2*3^(1/2))/(-2)}
t in { (2*3^(1/2)+3)/(-2), (3-2*3^(1/2))/(-2) }
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