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D( t )
t < 0
t < 0
t in <0:+oo)
3*t^(1/2) = 4*t // - 4*t
3*t^(1/2)-(4*t) = 0
3*t^(1/2)-4*t = 0
t_1 = t^(1/2)
3*t_1^1-4*t_1^2 = 0
3*t_1-4*t_1^2 = 0
DELTA = 3^2-(-4*0*4)
DELTA = 9
DELTA > 0
t_1 = (9^(1/2)-3)/(-4*2) or t_1 = (-9^(1/2)-3)/(-4*2)
t_1 = 0 or t_1 = 3/4
t_1 = 0
t^(1/2)+0 = 0
t^(1/2) = 0
1*t^(1/2) = 0 // : 1
t^(1/2) = 0
t = 0
t_1 = 3/4
t^(1/2)-3/4 = 0
1*t^(1/2) = 3/4 // : 1
t^(1/2) = 3/4
t^(1/2) = 3/4 // ^ 2
t = 9/16
t in { 0, 9/16 }
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