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D( f )
f = 0
f = 0
f = 0
f in (-oo:0) U (0:+oo)
12/f = 4 // - 4
12/f-4 = 0
12*f^-1 = 4 // : 12
f^-1 = 1/3
-1 < 0
1/(f^1) = 1/3 // * f^1
1 = 1/3*f^1 // : 1/3
3 = f^1
f = 3
f = 3
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