Art of Problem Solving - Trig Identities Wiki
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Advanced identities and problem-solving tips
More resources on Trigonometric Identities
MathsIsFun - Trigonometric Identities
Simple explanations and interactive examples
Paul's Online Math Notes - Trig Identities
Detailed proofs and examples of all major trig identities
Trigonometry
Master trigonometric identities! This course, by Sal Khan et al., provides a comprehensive understanding of trig functions & equations.
khanacademy.org
Khan Academy is a free online learning platform offering instructional videos, readings, and practice problems across math topics, including a comprehensive Trigonometry section. It features lessons on trig identities, proofs, graphing, and lots of guided practice with step-by-step explanations.
mathsisfun.com
MathsIsFun.com is a beginner-friendly math site offering clear explanations, worked examples, and practice, including a Trigonometry section that covers identities and related formulas.
sosmath.com
SOS Math is a free online math resource offering tutorials, formulas, and worked examples across topics like algebra and trigonometry, with a dedicated section on trigonometric identities featuring identities, proofs, and practice problems.