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C in (-oo:+oo)
C = 2*(2/3)*pi // - 2*(2/3)*pi
C-(2*(2/3)*pi) = 0
C+(-4/3)*pi = 0
C-4/3*pi = 0 // + -4/3*pi
C = -(-4/3*pi)
C = 4/3*pi
C = 4/3*pi
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