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9. Trigonometry
9.01 Trigonometric ratios review
9.02 Angles of elevation and depression
9.03 Bearings
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9.04 Solve problems involving right-angled triangles
9.05 Sine rule
9.06 Cosine rule
9.07 Area of non-right angled triangles
9.08 Solve problems involving either sine or cosine rule
9.09 Further trigonometric problems in 3D
9.10 Gradient of a line using trigonometric ratios
9.11 Angle between a line and a plane
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9.03 Bearings

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