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D( f )
f = 0
f = 0
f = 0
f in (-oo:0) U (0:+oo)
27/4 = 3/f // - 3/f
27/4-(3/f) = 0
27/4-3*f^-1 = 0
-3*f^-1 = -27/4 // : -3
f^-1 = 9/4
-1 < 0
1/(f^1) = 9/4 // * f^1
1 = 9/4*f^1 // : 9/4
4/9 = f^1
f = 4/9
f = 4/9
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