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D( t )
t < 0
t = 0
t < 0
t = 0
t = 0
t in (0:+oo)
2 = t^(-1/2) // - t^(-1/2)
2-t^(-1/2) = 0
-1*t^(-1/2) = -2 // : -1
t^(-1/2) = 2
-1/2 < 0
1/(t^(1/2)) = 2 // * t^(1/2)
1 = 2*t^(1/2) // : 2
1/2 = t^(1/2)
t^(1/2) = 1/2 // ^ 2
t = 1/4
t = 1/4
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