Discovering Trigonometric Identities in Geometric Representations

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Proving trigonometric identities are some students' least-favorite lessons. For us, those proofs are enjoyable puzzles for which the right algebraic manipulation leads to the desired outcome, but our students did not always find the same satisfaction in untangling those algebraic knots.

Contributor Notes

Craig J. Cullen, cjculle@ilstu.edu, is an associate professor in the department of mathematics at Illinois State University in Normal, Illinois.

Tami S. Martin, tsmartin@ilstu.edu, is a professor in the department of mathematics at Illinois State University.

(Corresponding author is Cullen cjculle@ilstu.edu)(Corresponding author is Martin tsmartin@ilstu.edu)
The Mathematics Teacher

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