Mathematics, 11.09.2021 14:20, wolffee895

Hi , can anyone help please? 7) Given triangle ABC alongside
a) Determine an expression for Angle A in terms of B and C
the answer here is A = 180° - B - C

I'm just not sure how to answer b!
b) Hence, prove that cos A = sin B sin C - cos B cos C

Answers: 3

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Hi , can anyone help please? 7) Given triangle ABC alongsidea) Determine an expression for Angle A in terms of B and Cthe answer here is A = 180° - B - CI'm just not sure how to answer b! b) Hence, prove that cos A = sin B sin C - cos B cos C ​

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Hi , can anyone help please? 7) Given triangle ABC alongside
a) Determine an expression for Angle A in terms of B and C
the answer here is A = 180° - B - C

I'm just not sure how to answer b!
b) Hence, prove that cos A = sin B sin C - cos B cos C