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D( v )
v = 0
v = 0
v = 0
v in (-oo:0) U (0:+oo)
3*v^(-3/5) = -(1/3) // + 1/3
3*v^(-3/5)+1/3 = 0
3*v^(-3/5) = -1/3 // : 3
v^(-3/5) = -1/9
-3/5 < 0
1/(v^(3/5)) = -1/9 // * v^(3/5)
1 = -1/9*v^(3/5) // : -1/9
-9 = v^(3/5)
v^(3/5) = -9 // ^ 5
v^3 = -59049 // ^ 1/3
v = -27*3^(1/3)
v = -27*3^(1/3)
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