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