TAS squared over g tan theta is a jolly useful formula! When I used to fly triangular aeroplanes, I really couldn't be @r$ed to draw a different track for different speeds at low level. The hole in the end of a standard RAF nav rule was always used for drawing the turns and I just varied the angle of bank to stay on track at different speeds!
It also enabled me to produce ALL the turn ranges for various AAR RV procedures for ATP56A back in 1991; didn't cost HM a cent as there was no such thing as GEMS back then! I evolved (and still have) the generic expressions for all RVs, although I could only solve the RV C by an iterative process. So if we suddenly decide to change any parameters (AoB, TAS split, roll-out range) then I can recalculate the turn ranges very quickly. But this time HM'll have to pay me for my troubles!!