Mathematical Methods · Unit 4 · Trigonometry · Cosine and sine rules

Model and solve problems that involve the sine rule, cosine rule and the area formula in two - and three-dimensional contexts (including bearings, directions and angles of elevation and depression), with and without technology. Mathematical Methods 2025 v1.3

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Use the cosine rule, 𝑐2 = 𝑎2 + 𝑏2 − 2𝑎𝑏 cos(𝐶).
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