This product is part of Unit 11 (Pythagorean Identity). Get the full unit or even better, the full year below: Algebra 2 Full Year Curriculum (lessons, Homework, Reviews, Assessments, Answer Keys, All editable)This Trigonometry lesson introduces the Pythagorean identities, fundamental relationships that connect the squares of trigonometric functions. Students learn how these identities are derived from the unit circle and the Pythagorean Theorem, and how to use them to simplify expressions and