A-Level Maths: E1-10 [Trigonometry: EXTENSION Proof of the Cosine Rule]

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Will this be coming up in the exam? I do Edexcel.

astudent
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Hey! im not sure if you still read these comments but by chance would you be able to lead me where I could find proof of the cosine rule however the scalene triangle has been extended to make a right angled triangle rather than been split into 2 right angled triangles?

IValchev