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Any ideas on how to calculate distance between two points in Polar coordinate system

**without**converting their coordinates to Cartesian?

Ps. I know that if I converted from Polar (r, t) to Cartesian (x, y) by x = r.cos(t), y = r.sin(t), then the distance between two points would be d = sqrt((x1 - x2)^2 + (y1 - y2)^2).

Thanks,

Steve