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D( g )
g = 0
g = 0
g = 0
g in (-oo:0) U (0:+oo)
-16/g = -4 // + 4
4-16/g = 0
-16*g^-1 = -4 // : -16
g^-1 = 1/4
-1 < 0
1/(g^1) = 1/4 // * g^1
1 = 1/4*g^1 // : 1/4
4 = g^1
g = 4
g = 4
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