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D( f )
f = 0
f = 0
f = 0
f in (-oo:0) U (0:+oo)
64/f = 464/290 // - 464/290
64/f-(464/290) = 0
64/f-8/5 = 0
64*f^-1 = 8/5 // : 64
f^-1 = 1/40
-1 < 0
1/(f^1) = 1/40 // * f^1
1 = 1/40*f^1 // : 1/40
40 = f^1
f = 40
f = 40
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