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16. Trigonometry
16.01 Trigonometric ratios
16.02 Angles of elevation and depression
16.03 Bearings
16.04 Exact ratios and the unit circle (Extended)
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16.05 Sine rule (Extended)
16.06 Cosine rule (Extended)
16.07 Area rule (Extended)
16.08 Applications (Extended)
16.09 Trigonometry in 3D (Extended)
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iGCSE (2021 Edition)

16.04 Exact ratios and the unit circle (Extended)

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