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h in (-oo:+oo)
15*h = 1/2 // - 1/2
15*h-(1/2) = 0
15*h-1/2 = 0
15*h-1/2 = 0 // + 1/2
15*h = 1/2 // : 15
h = 1/2/15
h = 1/30
h = 1/30
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