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D( t )
t = 0
t = 0
t = 0
t in (-oo:0) U (0:+oo)
8*(t/t-4)^2-(2*(t/t-4))-3 = 0
8*(t/t-4)^2-2*(t/t-4)-3 = 0
8*(-3)^2-3*(-2)-3 = 0
8*(-3)^2-3*(-2)-3 = 0
78-3 = 0
75 = 0
75 = 0
75 = 0
t belongs to the empty set
t belongs to the empty set
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