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D( f )
f = 0
f = 0
f = 0
f in (-oo:0) U (0:+oo)
7/8 = f/f-6 // - f/f-6
7/8-(f/f)+6 = 0
7/8-1+6 = 0
47/8 = 0
f belongs to the empty set
f belongs to the empty set
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