Enrich · Mathematics Extension 2 11–12 – Year 12 · Further integration
Enrich Derive the expressions sinA = (2t)/(1 + t²), cosA = (1 - t²)/(1 + t²) and tanA = (2t)/(1 - t²) where t = tanA/2 (the t - formulas) and use them to solve trigonometric equations over restricted domains
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