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Px - Py * (cos2θ)+ Pxy = 1
Pxy + Px - Py *(cos2θ) = 1
P(xy + x - y) * (cos2θ - sin2θ) = 1
P = ((cos2θ-sin2θ)(xy + x - y))^-1
All my tubes and wires – and careful notes!
And antiquated notions…