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D( f )
f = 0
f = 0
f = 0
f in (-oo:0) U (0:+oo)
5/3 = 8/f // - 8/f
5/3-(8/f) = 0
5/3-8*f^-1 = 0
-8*f^-1 = -5/3 // : -8
f^-1 = 5/24
-1 < 0
1/(f^1) = 5/24 // * f^1
1 = 5/24*f^1 // : 5/24
24/5 = f^1
f = 24/5
f = 24/5
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