Printables

A Pythagorean-Style Proof of the Sine Sum-of-Angles Formula

Curated and Reviewed by Lesson Planet

This well organized poster shows a step-by-step algebraic proof and related graphic. Understanding how formulas were derived, connects learners to the idea that the study of mathematics is continuous and cumulative. Learners will also develop a deeper appreciation for the formulas used in trigonometry. 

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Pros
  • Well organized, short and to the point
Cons
  • None