Re: [幾何] 高中三角函數
※ 引述《mack (腦海裡依然記得妳)》之銘言:
: 三角形ABC,滿足AB=3,AC=5,角BAC=120度,M為BC中點,求tanBAM
令A(0,0)
B(3,0)
C(5cos120,5sin120)=(-5/2, 5√3 /2)
=>M(1/4 , 5√3 /4)
tan∠BAM = y/x =5√3
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