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Enrich · Mathematics Extension 1 11–12 – Year 11 · Further trigonometry

Enrich Derive the double angle formulas sin⁡2A = 2sin⁡Acos⁡A, cos⁡2A = cos²⁡A - sin²⁡A = 2cos²⁡A - 1 = 1 - 2(sin)²A and tan⁡2A = (2tan⁡A)/(1 - (tan)²A)

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