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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
Y = 48/x // - 48/x
Y-(48/x) = 0
Y-48*x^-1 = 0
-48*x^-1 = -Y // : -48
x^-1 = Y/48
-1 < 0
1/(x^1) = Y/48 // * x^1
1 = (Y/48)*x^1 // : Y/48
48*Y^-1 = x^1
x = 48*Y^-1
x = 48*Y^-1
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