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

Enrich Derive the expressions sin⁡A = (2t)/(1 + t²), cos⁡A = (1 - t²)/(1 + t²) and tan⁡A = (2t)/(1 - t²) where t = tan⁡A/2 (the t - formulas) and use them to solve trigonometric equations over restricted domains

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