F-TF.8
Prove the Pythagorean identity sin^2(θ) + cos^2(θ) = 1 and use it to calculate trigonometric ratios.
Example Problems
Find
Find .
Find
Khan Academy Resources
1-on-1 AI tutoring aligned to F-TF.8. Instant help for students, real-time insights for teachers.
Used in classrooms by 100,000+ students at Baltimore County, Plano ISD, Deer Valley USD, KIPP, and districts nationwide.
Free for teachers, forever →