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D( t )
-16*t-(64/t) = 0
t = 0
-16*t-(64/t) = 0
-16*t-(64/t) = 0
-16*t-64*t^-1 = 0
-16*t^1-64*t^-1 = 0
(-16*t^2-64*t^0)/(t^1) = 0 // * t^2
t^1*(-16*t^2-64*t^0) = 0
t^1
-16*t^2-64 = 0
-16*t^2-64 = 0
DELTA = 0^2-(-64*(-16)*4)
DELTA = -4096
DELTA < 0
t in { }
t = 0
t = 0
t in (-oo:0) U (0:+oo)
t = (16*t^2+64)/(-16*t-(64/t)) // - (16*t^2+64)/(-16*t-(64/t))
t-((16*t^2+64)/(-16*t-(64/t))) = 0
t-((16*t^2+64)/(-16*t-64*t^-1)) = 0
(-1*(16*t^2+64))/(-16*t-64*t^-1)+t = 0
-16*t-64*t^-1 = 0
-16*t-64*t^-1 = 0
-16*t^-1*(t^2+4) = 0
1*t^2 = -4 // : 1
t^2 = -4
-16/t = 0
(-1*(16*t^2+64))/(-16*t^-1)+t = 0
(-1*(16*t^2+64))/(-16*t^-1)+(-16*t^-1*t)/(-16*t^-1) = 0
-1*(16*t^2+64)-16*t^-1*t = 0
-16*t^2-80 = 0
(-16*t^2-80)/(-16*t^-1) = 0
(-16*t^2-80)/(-16*t^-1) = 0 // * -16/t
-16*t^2-80 = 0
-16*t^2 = 80 // : -16
t^2 = -5
t belongs to the empty set
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