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D( v )
v = 0
4*v^-24*v-64 = 0
v = 0
v = 0
4*v^-24*v-64 = 0
4*v^-24*v-64 = 0
4*v^-23 = 64 // : 4
v^-23 = 16
-23 < 0
1/(v^23) = 16 // * v^23
1 = 16*v^23 // : 16
1/16 = v^23
v^23 = 1/16 // ^ 1/23
v = (1/16)^(1/23)
v in (-oo:0) U (0:(1/16)^(1/23)) U ((1/16)^(1/23):+oo)
(v^-3*v-40)/(4*v^-24*v-64) = 0
(v^-2-40)/(4*v^-23-64) = 0
1*v^-2 = 40 // : 1
v^-2 = 40
-2 < 0
1/(v^2) = 40 // * v^2
1 = 40*v^2 // : 40
1/40 = v^2
v^2 = 1/40 // ^ 1/2
abs(v) = (1/40)^(1/2)
v = (1/40)^(1/2) or v = -(1/40)^(1/2)
v in { (1/40)^(1/2), -(1/40)^(1/2) }
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