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D( f )
f = 0
f = 0
f = 0
f in (-oo:0) U (0:+oo)
5/12 = -4/f // + -4/f
5/12-(-4/f) = 0
4*f^-1+5/12 = 0
4*f^-1 = -5/12 // : 4
f^-1 = -5/48
-1 < 0
1/(f^1) = -5/48 // * f^1
1 = -5/48*f^1 // : -5/48
-48/5 = f^1
f = -48/5
f = -48/5
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