高三文科数学[三角形中的三角函数].ppt
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1.掌握正弦定理、余弦定理,并能解决
一些简单的三角度量问题。
2.能够运用正弦定理、余弦定理等知识
和方法解决一些与测量和几何计算有关
的实际问题。
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(2) 余弦定理:
余弦定理可变形为:
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= .
例1
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例2
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= .
例3
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例4
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例5
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例6
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1.利用正弦定理、余弦定理将三角形的边角转化、三角形形状的判断、进行三角形内三角函数的求值及三角恒等式的证明.
2.解决三角形中的问题,要从统一着手,
或统一成角的关系,或统一成边的关系,
要视情况灵活处理.
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《单元滚动卷检测一》
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