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D( h )
h = 0
h = 0
h = 0
h in (-oo:0) U (0:+oo)
45/h = 270 // - 270
45/h-270 = 0
45*h^-1 = 270 // : 45
h^-1 = 6
-1 < 0
1/(h^1) = 6 // * h^1
1 = 6*h^1 // : 6
1/6 = h^1
h = 1/6
h = 1/6
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