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7) Given triangle ABC alongside: a) Determine an expression for Angle A in terms of B and C. b) Hence, prove that cos A = sin B sin C - cos B cos C. В. C​
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7) Given triangle ABC alongside: a) Determine an expression for Angle A in terms of B and C. b) Hence, prove that cos A = sin B sin C - cos B cos C. В. C​

User Titin
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Answer:

a=sin is the answer of that question

User Nebojsa Susic
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