A-Level Maths: E1-11 [Trigonometry: Using the Cosine Rule]

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I was just wondering in question 2, the unknown angle is labelled as B but then the opposite side is a, shouldn't the opposite side be b?

karamrai-wagerssquadbuilde
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But our book is written when we have 3 sides we use the first formula and when we have 2sides+an angel we use the second formula

faezah_rj