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Compound trapezoid formula and complexification Xinbo Health formula calculated integral I_1 (f) = ∫ _0 ^ (π/2) ? √ (1+cos ^ 2 ? x) dx and I_2 (f) = ∫ _0 ^ (π/2) ? The 〖tan ? x/x dx〗 observed n is the number obtained approximation of six significant digits.