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D( v )
2*v^9 = 0
2*v^9 = 0
2*v^9 = 0
2*v^9 = 0 // : 2
v^9 = 0
v = 0
v in (-oo:0) U (0:+oo)
(-12*v^3)/(2*v^9) = 0
-6*v^-6 = 0 // : -6
v^-6 = 0
v należy do O
v belongs to the empty set
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