Mathematics, 11.09.2021 14:00 math9878

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

Hi , can anyone help please?

7) Given triangle ABC alongsidea) Determine an expression for Angle

Answers: 2

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Hi , can anyone help please? 7) Given triangle ABC alongside

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More questions: Mathematics Another questions

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 - C I'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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Another question on Mathematics

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