A simple identity Student activity Play

Applying double-angle formulas to prove a trigonometric identity Whiteboard exercise Play

Applying the difference identity for the cosine Whiteboard exercise Play

Applying the sum identity for the sine Whiteboard exercise Play

Applying trigonometric identities to equations Whiteboard exercise Play

Applying trigonometric identities to equations Student activity Play

Basic trigonometric identities Whiteboard exercise Play

Basic trigonometric identities Student activity Play

Constructing the graph of the sine function Animation Play

Difference identity for the cosine Animation Play

Finding  cosx Whiteboard exercise Play

Finding  cotx Whiteboard exercise Play

Finding  sinx Whiteboard exercise Play

Identities in trigonometric equations Animation Play

Identity or not? Animation Play

Justification of the cotangent function identity Animation Play

Justification of the tangent function identity Animation Play

Proving a trigonometric identity Animation Play

Proving identities Whiteboard exercise Play

Proving identities Student activity Play

Proving identity for the tangent Whiteboard exercise Play

Proving trigonometric identities Whiteboard exercise Play

Proving trigonometric identities Student activity Play

Proving trigonometric identity using the Pythagorean identity Whiteboard exercise Play

Sum identity for the cosine Animation Play