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Fij = 1/Ai \int \int \frac{\cos\theta_i \cos\theta_o}{\pi r^2} dAi dAj
Fij = 1/Ai \int \int \cos\theta_i \cos\theta_o / (\pi r^2) dAi dAj
\int_[0...1] x^(n+1) * 1 / (x^(n)) dx instead of \int_[0...1] xdx.
\int_[0...1] x^(n+1) * 1 / (x^(n)) dx instead of \int_[0...1] xdx
F[N2 -> N1] = ((  r dot N1 * -r dot N2 * dA2) / ( pi*|r|^2)