'(= (Machine_Angle_Of_Contact ?X)
(+ 90
(+ (Invsin (/ (Machine_Sheave_To_Deflector_Sheave ?X)
(Machine_Sheave_To_Deflector_Sheave_Diagonal ?X)))
(Invsin (/ (- (/ (Machine_Sheave_Diameter
(Elevator.Machine ?X))
2)
(/ (Deflector_Sheave_Diameter ?X) 2))
(Machine_Sheave_To_Deflector_Sheave_Diagonal ?X))))))