'(= (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))))))