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D( v )
317.5^3 = 0
317.5^3 = 0
317.5^3 = 0
317.5^3 = 0
v belongs to the empty set
v in (-oo:+oo)
v = 4/(317.5^3) // - 4/(317.5^3)
v-(4/(317.5^3)) = 0
v-4*317.5^-3 = 0
v-4*317.5^-3 = 0 // + -4*317.5^-3
v = -(-4*317.5^-3)
v = 4*317.5^-3
v = 4*317.5^-3
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