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