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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
((3/4)/1)/2 = 0.25/x // - 0.25/x
((3/4)/1)/2-(0.25/x) = 0
(3/4)/2-0.25*x^-1 = 0
-0.25*x^-1 = -3/8 // : -0.25
x^-1 = 1.5
-1 < 0
1/(x^1) = 1.5 // * x^1
1 = 1.5*x^1 // : 1.5
0.66666667 = x^1
x = 0.66666667
x = 0.66666667
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