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D( t )
t = 0
t = 0
t = 0
t in (-oo:0) U (0:+oo)
9 = (2*144)/t // - (2*144)/t
9-((2*144)/t) = 0
9-288*t^-1 = 0
-288*t^-1 = -9 // : -288
t^-1 = 1/32
-1 < 0
1/(t^1) = 1/32 // * t^1
1 = 1/32*t^1 // : 1/32
32 = t^1
t = 32
t = 32
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