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D( V )
V = 0
V = 0
V = 0
V in (-oo:0) U (0:+oo)
(92/23)^3 = 240/V // - 240/V
(92/23)^3-(240/V) = 0
(92/23)^3-240*V^-1 = 0
-240*V^-1 = -64 // : -240
V^-1 = 4/15
-1 < 0
1/(V^1) = 4/15 // * V^1
1 = 4/15*V^1 // : 4/15
15/4 = V^1
V = 15/4
V = 15/4
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