Instructional Video
Khan Academy: Trigonometry: Sine & Cosine Identities: Periodicity Instructional Video
Khan Academy

Khan Academy: Trigonometry: Sine & Cosine Identities: Periodicity

9th - 10th Standards
Sal finds trigonometric identities for sine and cosine by considering angle rotations on the unit circle. [6:13]
Get Free Access See Review
Instructional Video
Khan Academy: Trigonometry: Tangent Identities: Periodicity Instructional Video
Khan Academy

Khan Academy: Trigonometry: Tangent Identities: Periodicity

9th - 10th Standards
Sal solves a problem by considering the periodicity of the tangent function. [4:01]
Get Free Access See Review