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D( F )
F = 0
F = 0
F = 0
F in (-oo:0) U (0:+oo)
16/F = 8 // - 8
16/F-8 = 0
16*F^-1 = 8 // : 16
F^-1 = 1/2
-1 < 0
1/(F^1) = 1/2 // * F^1
1 = 1/2*F^1 // : 1/2
2 = F^1
F = 2
F = 2
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