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D( h )
h = 0
h = 0
h = 0
h in (-oo:0) U (0:+oo)
-10/h = e // - e
-10/h-e = 0
-10*h^-1 = e // : -10
h^-1 = e/(-10)
-1 < 0
1/(h^1) = e/(-10) // * h^1
1 = (e/(-10))*h^1 // : e/(-10)
-10*e^-1 = h^1
h = -10*e^-1
h = -10*e^-1
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