Contributor Khan Academy

Update
01-01-2016
Content Type
Lesson
Grade Level
Ninth grade, Tenth grade, Eleventh grade, Twelfth grade
Object Type
Video
License

This video lesson introduces and proves the identity (sinθ)^2+(cosθ)^2=1, which arises from the Pythagorean theorem. Students can read the transcript of the video if they like. They can also view other students’ questions and answers about the topic in the comment section.