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D( f )
f = 0
f = 0
f = 0
f in (-oo:0) U (0:+oo)
48/f = 2 // - 2
48/f-2 = 0
48*f^-1 = 2 // : 48
f^-1 = 1/24
-1 < 0
1/(f^1) = 1/24 // * f^1
1 = 1/24*f^1 // : 1/24
24 = f^1
f = 24
f = 24
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