Write the sum as a product: sin(21.4b) \text{ } - \text{ } sin(2.6b) =
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So, sin(21.4b) * sin(2.6b) = (1/2) * [cos(21.4b - 2.6b) - cos(21.4b + 2.6b)]. Simplifying the angles inside the cosine functions, we get: = (1/2) * [cos(18.8b) - cos(24b)]. Show more…
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