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D( h )
h = 0
h = 0
h = 0
h in (-oo:0) U (0:+oo)
11/4 = 77/h // - 77/h
11/4-(77/h) = 0
11/4-77*h^-1 = 0
-77*h^-1 = -11/4 // : -77
h^-1 = 1/28
-1 < 0
1/(h^1) = 1/28 // * h^1
1 = 1/28*h^1 // : 1/28
28 = h^1
h = 28
h = 28
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