Curated OER
Trigonometry Worksheet: Addition Formula
In this trigonometry worksheet, students solve 2 problems involving the addition formula. Students find the sine of a given angle using the addition formula.
Math Medics
S.o.s. Math: Trigonometry: The Addition Formulas
This math lesson contains a list of trigonometric addition formulas. Includes example problems involving these formulas along with solutions.
Wolfram Research
Wolfram Math World: Trigonometric Addition Formulas
This tutorial offers formulas and explanations on trigonometric addition formulas and features an easy way to remember the sine and cosine addition formulas using matrices.