百度试题 结果1 题目问几个英文单词1.Mean,Medianand Mode2.Trigonometrical Ratios几个关于数学方面的词 相关知识点: 试题来源: 解析 Mean:手段 Medianand Mode:方式 Trigonometrical Ratios: 比率反馈 收藏
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Given that: scCθ=(13)/(12)Let scCθ=(13k)/(12k), where k is a real number.In △ABC, by Pythagoras theorem, we haveBC^2=AC^2-AB^2=(13k)^2-(12k)^2=169k^2-144k^2=25k^2⇒BC=√(25k^2)=5kHence, sinθ=(BC)/(AC)=(5k)/(13k)=5/(13)cosθ=(AB)/(AC)=(12k)...
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