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D( o )
o = 0
o = 0
o = 0
o in (-oo:0) U (0:+oo)
3/2 = 3.5/o // - 3.5/o
3/2-(3.5/o) = 0
3/2-3.5*o^-1 = 0
-3.5*o^-1 = -3/2 // : -3.5
o^-1 = 0.42857143
-1 < 0
1/(o^1) = 0.42857143 // * o^1
1 = 0.42857143*o^1 // : 0.42857143
2.33333333 = o^1
o = 2.33333333
o = 2.33333333
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