Course: H.S. Precalculus: Trigonometry

 

TR.ID.4

Prove the double- and half-angle identities for sine, cosine, and tangent. Use the identities to solve problems.

I Can Statements Academic Vocabulary

*I can prove the double-angle identity for sine, cosine, and tangent using the addition identities.

*I can prove the half-angle identity for sine, cosine, and tangent.

*I can use the double- and half-angle identities for sine, cosine, and tangent to solve problems.

Double-angle formula
Half-angle formula
Sine
Cosine
Tangent

Looking Back Looking Ahead

*Although this is an introductory standard for this concept, strong algebraic skills, computation skills, and number sense are needed.

*The concepts and skills in this standard are an integral part of calculus, college-level algebra, and beyond.

Clarifying Examples and Digital Resources
Click here for clarifying examples and digital resources aligned to Indiana standards. These are intended to expand each standard to support instruction in the classroom as evidenced by the Eight Mathematics Teaching Practices put forth by the National Council of Teachers of Mathematics (NCTM).