Product-to-Sum Identities | Formula, Derivation & Examples
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Math Central on Instagram: "The sine of a sum identity is a trigonometric formula that allows us to find the sine of two angles added together by breaking it into simpler parts. Instead of calculating sin(a + b) directly, the identity expresses it as sin(a)cos(b) + cos(a)sin(b). This works because sine and cosine represent coordinates on the unit circle, and when two angles are added, their combined effect can be understood through rotating one angle by another. The formula essentially captures
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