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D( f )
f = 0
f = 0
f = 0
f in (-oo:0) U (0:+oo)
1/2 = 3/f // - 3/f
1/2-(3/f) = 0
1/2-3*f^-1 = 0
-3*f^-1 = -1/2 // : -3
f^-1 = 1/6
-1 < 0
1/(f^1) = 1/6 // * f^1
1 = 1/6*f^1 // : 1/6
6 = f^1
f = 6
f = 6
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