cD是平面镜,光线从A出发经cD上点E发射后照射到B,若入射角为a,AC垂直CD,BD垂直CD,AC=3,BD=6,CD=1...cD是平面镜,光线从A出发经cD上点E发射后照射到B,若入射角为a,AC垂直CD,BD垂直CD,AC=3,BD=6,CD=11,求tana.
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![cD是平面镜,光线从A出发经cD上点E发射后照射到B,若入射角为a,AC垂直CD,BD垂直CD,AC=3,BD=6,CD=1...cD是平面镜,光线从A出发经cD上点E发射后照射到B,若入射角为a,AC垂直CD,BD垂直CD,AC=3,BD=6,CD=11,求tana.](/uploads/image/z/2458127-47-7.jpg?t=cD%E6%98%AF%E5%B9%B3%E9%9D%A2%E9%95%9C%2C%E5%85%89%E7%BA%BF%E4%BB%8EA%E5%87%BA%E5%8F%91%E7%BB%8FcD%E4%B8%8A%E7%82%B9E%E5%8F%91%E5%B0%84%E5%90%8E%E7%85%A7%E5%B0%84%E5%88%B0B%2C%E8%8B%A5%E5%85%A5%E5%B0%84%E8%A7%92%E4%B8%BAa%2CAC%E5%9E%82%E7%9B%B4CD%2CBD%E5%9E%82%E7%9B%B4CD%2CAC%3D3%2CBD%3D6%2CCD%3D1...cD%E6%98%AF%E5%B9%B3%E9%9D%A2%E9%95%9C%2C%E5%85%89%E7%BA%BF%E4%BB%8EA%E5%87%BA%E5%8F%91%E7%BB%8FcD%E4%B8%8A%E7%82%B9E%E5%8F%91%E5%B0%84%E5%90%8E%E7%85%A7%E5%B0%84%E5%88%B0B%2C%E8%8B%A5%E5%85%A5%E5%B0%84%E8%A7%92%E4%B8%BAa%2CAC%E5%9E%82%E7%9B%B4CD%2CBD%E5%9E%82%E7%9B%B4CD%2CAC%3D3%2CBD%3D6%2CCD%3D11%2C%E6%B1%82tana.)
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cD是平面镜,光线从A出发经cD上点E发射后照射到B,若入射角为a,AC垂直CD,BD垂直CD,AC=3,BD=6,CD=1...cD是平面镜,光线从A出发经cD上点E发射后照射到B,若入射角为a,AC垂直CD,BD垂直CD,AC=3,BD=6,CD=11,求tana.
cD是平面镜,光线从A出发经cD上点E发射后照射到B,若入射角为a,AC垂直CD,BD垂直CD,AC=3,BD=6,CD=1...
cD是平面镜,光线从A出发经cD上点E发射后照射到B,若入射角为a,AC垂直CD,BD垂直CD,AC=3,BD=6,CD=11,求tana.
cD是平面镜,光线从A出发经cD上点E发射后照射到B,若入射角为a,AC垂直CD,BD垂直CD,AC=3,BD=6,CD=1...cD是平面镜,光线从A出发经cD上点E发射后照射到B,若入射角为a,AC垂直CD,BD垂直CD,AC=3,BD=6,CD=11,求tana.
设光在E点的法线为EH,点H与A,B在CD的同一侧
由题意角BEH=角AEH
因为AC垂直CD,BD垂直CD,HE垂直CD,
则AC平行于BD平行于EH
有角DBE=角BEH,角CAE=角AEH,
有角DBE=角EAC,则直角三角形EAC与EBD相似
有CE/DE=AC/BD=1/2,又CE+DE=CD=11
代入数据得CE=11/3
故tana=tanEAC=EC/AC=11/9
11/9