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v in (-oo:+oo)
v = 2*(1/3)*pi^(2^2) // - 2*(1/3)*pi^(2^2)
v-(2*(1/3)*pi^(2^2)) = 0
v+(-2/3)*pi^(2^2) = 0
v-2/3*pi^4 = 0 // + -2/3*pi^4
v = -(-2/3*pi^4)
v = 2/3*pi^4
v = 2/3*pi^4
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