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D( f )
f = 0
f = 0
f = 0
f in (-oo:0) U (0:+oo)
5/f = 20/8 // - 20/8
5/f-(20/8) = 0
5/f-5/2 = 0
5*f^-1 = 5/2 // : 5
f^-1 = 1/2
-1 < 0
1/(f^1) = 1/2 // * f^1
1 = 1/2*f^1 // : 1/2
2 = f^1
f = 2
f = 2
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