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D( v )
v^3 = 0
v^3 = 0
v^3 = 0
1*v^3 = 0 // : 1
v^3 = 0
v = 0
v in (-oo:0) U (0:+oo)
((21*v^6)/(v^3))*((16*v^5)/98)*v^6 = 0
24/7*v^14 = 0 // : 24/7
v^14 = 0
v = 0
v in { 0}
v belongs to the empty set
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