N[1/(Cos[1/ 3] -2)Sum[(-\[Pi]^2)^n/Factorial[2 n] Cos[1/3 2^n], {n, 0, 150}], 35]N[1/(Cos[1/ 3] -2)Sum[(-\[Pi]^2)^n/Factorial[2 n] Cos[1/3 2^n], {n, 0, 150}], 35]

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