411 REFERENCE · Wikibooks
Trigonometry/Sum into Product
Reference material by Wikibooks contributors. This retains its source identity and is not 411 news reporting.
These are exercises on the formulae derived in Book 1 for converting the sum or difference of two sines or two cosines into a product.
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pt:Matemática elementar/Trigonometria/Transformações de soma de funções trigonométricas em produtos/Exercícios