PrecalculusNot startedOpen topic workspace Not startedOpen topic workspace Not startedOpen topic workspace Not startedOpen topic workspace Not startedOpen topic workspace
Unit 9 of 20
Trigonometric Identities
Equations that hold for all inputs.
Every topic follows the curriculum standard
Learn→See→Try→Explain→Verify→Challenge→Transfer→Master
Topics in this unit
6 topics. Each card opens a full topic workspace and supports all eight learning actions.
Fundamental Identities
Pythagorean and reciprocal
Verifying Identities
Proof techniques
Sum & Difference Formulas
sin(a±b), cos(a±b)
Double-Angle Formulas
sin(2a), cos(2a)
Half-Angle Formulas
The bisection
Three-pathway connections
Study this unit at three depths — current-grade mastery, advanced thinking, and competition mathematics.