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D( f )
f = 0
f = 0
f = 0
f in (-oo:0) U (0:+oo)
(40-8)/f = 2 // - 2
(40-8)/f-2 = 0
32*f^-1 = 2 // : 32
f^-1 = 1/16
-1 < 0
1/(f^1) = 1/16 // * f^1
1 = 1/16*f^1 // : 1/16
16 = f^1
f = 16
f = 16
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