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1 本单元知识网络1 )正弦定理 :asinA=bsinB=csinC.2 )余弦定理 :a2 =b2 +c2 - 2bccosA ;b2=c2 +a2 - 2accosB ;c2 =a2 +b2 -2abcosC .3)解应用题 :将实际问题抽象为数学问题 ,归结为解三角形 .2 重点、难点、热点分析1 )重点 :对用向量法推导正弦定理、余弦定理的数学方法的
1 The unit knowledge network 1) Sine theorem: asinA = bsinB = csinC.2) Cosine Theorem: a2 = b2 + c2 - 2bccosA ; b2 = c2 + a2 - 2accosB ; c2 = a2 + b2 - 2abcosC .3) Solution Problem : The actual problem is abstracted as a mathematical problem, which is attributed to the solution of a triangle. 2 Key points, difficulties, and hotspot analysis 1) Focus: Mathematical methods for deriving the sine and cosine theorems using vector methods