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AQA/A2 Maths - Trigonometry : Compound Angle (Addition Formulae) Proof
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This video goes over how to derive the compound angle formulae/identities.
It is on the syllabus that you are able to derive the identities when given the diagram similar that in the video
It is on the syllabus that you are able to derive the identities when given the diagram similar that in the video