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D( v )
v = 0
v = 0
v = 0
v in (-oo:0) U (0:+oo)
36/v = 9/16 // - 9/16
36/v-(9/16) = 0
36/v-9/16 = 0
36*v^-1 = 9/16 // : 36
v^-1 = 1/64
-1 < 0
1/(v^1) = 1/64 // * v^1
1 = 1/64*v^1 // : 1/64
64 = v^1
v = 64
v = 64
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