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Mathematics · L3 · Sum, Difference & Double-Angle Identities

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Choosing and building the right identity: angle sum/difference formulas for sine and cosine, and the double-angle special case.

by @openstemUpdated Mathematics
🧩 Angle made of two known pieces?Same angle twice? A = B⭐ Double-angle formulassin or cos?sin A cos B ± cos A sin Bcos A cos B ∓ sin A sin Bsin 2θ = 2 sin θ cos θcos 2θ = cos²θ − sin²θyesno, A ± Bsincos

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