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D( g )
g = 0
g = 0
g = 0
g in (-oo:0) U (0:+oo)
45/240 = 3/g // - 3/g
45/240-(3/g) = 0
45/240-3*g^-1 = 0
-3*g^-1 = -3/16 // : -3
g^-1 = 1/16
-1 < 0
1/(g^1) = 1/16 // * g^1
1 = 1/16*g^1 // : 1/16
16 = g^1
g = 16
g = 16
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