In this lesson, we will learn how to use the product-to-sum identity to simplify and evaluate trigonometric expression.
Q1:
Simplify sincoscossin(𝑥+𝑦)𝑦−(𝑥+𝑦)𝑦.
Q2:
Simplify coscos(𝐴−𝐵)−(𝐴+𝐵).
Q3:
Simplify sinsin(𝐴+𝐵)−(𝐴−𝐵).
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