(a) Show that for any triangle ABC, we have a = b cos C + c cos B. (b) Use part (a) and
Chapter 9, Problem 9.2.26(choose chapter or problem)
(a) Show that for any triangle ABC, we have a = b cos C + c cos B. (b) Use part (a) and the Law of Sines to obtain the sum formula for sine. [Hint: Why is sin A = sin(B + C)?]
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