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D( f )
f = 0
f = 0
f = 0
f in (-oo:0) U (0:+oo)
17.04/f = 5.68 // - 5.68
17.04/f-5.68 = 0
17.04*f^-1 = 5.68 // : 17.04
f^-1 = 0.33333333
-1 < 0
1/(f^1) = 0.33333333 // * f^1
1 = 0.33333333*f^1 // : 0.33333333
3.00000003 = f^1
f = 3.00000003
f = 3.00000003
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