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2019高考数学二轮复习专题一三角函数与解三角形规范答题示范课件.ppt

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规范答题示范三角函数及解三角形解答题,规范解答,解题程序 第一步：由面积公式，建立边角关系； 第二步：利用正弦定理，将边统一为角的边，求sin Bsin C的值； 第三步：利用条件与(1)的结论，求得cos(BC)，进而求角A； 第四步：由余弦定理与面积公式，求bc及bc，得到ABC的周长； 第五步：检验易错易混，规范解题步骤，得出结论.,由3a2b知，ab，A为锐角，,(2)b6，ab23，a4.,

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