Consider the following premises. There is at least one x_11 for which if x_11 were curious, then x_11 is sad. For all x_11, x_11 is a police officer or x_11 is not sad. For all x_11, x_11 is a police officer or x_11 will not listen to a song. For all x_11, x_11 will listen to a song or x_11 is curious. Can we infer the following from them? If we can, name the inference rule being used: For all x_11, x_11 is a police officer or x_11 is not sad.
That is one of the premises. Therefore, the answer is yes.