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58问答库 > 倾斜角为钝角的直线的斜率怎么求

倾斜角为钝角的直线的斜率怎么求

2025-04-08 08:26:50

推荐回答（3个）

回答（1）：

倾斜角为钝角的直线的斜率利用 k=tana 求。 (k表示直线的斜率，a表示直线的倾斜角)

回答（2）：

你应该学了sina(a+b)=sinasinb+cosacosb
cos(a+b)=cosacosb-sinasinabtan(180-a)=sina(180-a)/cos(180-a)=sin(a+(-180))/cos(a+(-180))化为了2个角度的和求正余弦，把上边2个公式代入即可证明

回答（3）：

斜率=tan 倾斜角

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