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Hi everyone, I am trying to calculate a 2d Integral which has another 2d integral in the integrands. here is the setup: [mcode]alpha = 1; sigma1 = 4; sigma2 = 1; phi = 0.5; a = 0.5*(Cos[phi]/sigma1)^2 + 0.5*(Sin[phi]/sigma2)^2 b =...