题目

Recently, a facial recognition app Deepfake went popular, as it allowed users to replace the faces of actors or actresses with their own in video clips of popular TV series or movies. Yet merely days later, the app's developer, was summoned and questioned by the Ministry of Industry and Information Technology about the problem of the user agreement and risks of data revealing. This has raised people's concerns about the use and regulation of the facial recognition technology.Facial recognition refers to the process of identifying a person by capturing, comparing and matching the verifiable (已知角α终边上一点P（-4，3），求的值．