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D( t )
t = 0
t = 0
t = 0
t in (-oo:0) U (0:+oo)
4/t-10 = 6/t-6 // - 6/t-6
4/t-(6/t)-10+6 = 0
4/t-6*t^-1-10+6 = 0
-2*t^-1 = 4 // : -2
t^-1 = -2
-1 < 0
1/(t^1) = -2 // * t^1
1 = -2*t^1 // : -2
-1/2 = t^1
t = -1/2
t = -1/2
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