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- G20b – Trigonometric ratios – sin, cos and tan
- G20c – Inverse trigonometric functions
- G22a – The sine rule – knowledge of the convention to label sides and opposite angles a, b,c, and A, B and C respectively is required for this whole lesson, and knowledge of the sine rule itself is required for the Gamma exercise
- G22b – The cosine rule – knowledge of the cosine rule is required for the Gamma exercise