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D( v )
v = 0
v = 0
v = 0
v in (-oo:0) U (0:+oo)
3/v-3 = 0
3*v^-1 = 3 // : 3
v^-1 = 1
-1 < 0
1/(v^1) = 1 // * v^1
1 = 1*v^1 // : 1
1 = v^1
v = 1
v = 1
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