Right. The cosine term goes to anti-torque and the sine term to aircraft lift, which isn’t quite how your text read. For a very small increase in power required for anti-torque, a significant amount of lift is produced and at a location that helps the unfortunate tendency for tail heavy helicopter designs.
The Sikorsky flexbeam tail rotor and the tail rotor cant are two of the more elegant pieces of engineering to happen on the rear of a VTOL machine in generations.