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D( h )
h = 0
h = 0
h = 0
h in (-oo:0) U (0:+oo)
4/5 = 12/h // - 12/h
4/5-(12/h) = 0
4/5-12*h^-1 = 0
-12*h^-1 = -4/5 // : -12
h^-1 = 1/15
-1 < 0
1/(h^1) = 1/15 // * h^1
1 = 1/15*h^1 // : 1/15
15 = h^1
h = 15
h = 15
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