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D( v )
v = 0
v = 0
v = 0
v in (-oo:0) U (0:+oo)
11*v-(12/v)-5 = 0
11*v-12*v^-1-5 = 0
11*v^1-12*v^-1-5*v^0 = 0
(11*v^2-5*v^1-12*v^0)/(v^1) = 0 // * v^2
v^1*(11*v^2-5*v^1-12*v^0) = 0
v^1
11*v^2-5*v-12 = 0
11*v^2-5*v-12 = 0
DELTA = (-5)^2-(-12*4*11)
DELTA = 553
DELTA > 0
v = (553^(1/2)+5)/(2*11) or v = (5-553^(1/2))/(2*11)
v = (553^(1/2)+5)/22 or v = (5-553^(1/2))/22
v in { (5-553^(1/2))/22, (553^(1/2)+5)/22}
v in { (5-553^(1/2))/22, (553^(1/2)+5)/22 }
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