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Enrich · Mathematics Extension 2 11–12 – Year 12 · Further integration

Enrich Derive the identities for trigonometric products as sums and differences for cos⁡Acos⁡B = 1/2(cos⁡(A - B) + cos⁡(A + B)), sin⁡Asin⁡B = 1/2(cos⁡(A - B) - cos⁡(A + B)), sin⁡Acos⁡B = 1/2(sin⁡(A + B) + sin⁡(A - B)) and cos⁡Asin⁡B = 1/2(sin⁡(A + B) - sin⁡(A - B))

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