一道国外的微分题目A lighthouse is located on a small island 2 km away from the nearest point P on a straight shoreline and its light makes four revolutions per minute.How fast is the beam of light moving along the shoreline when it is 1 km f

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一道国外的微分题目A lighthouse is located on a small island 2 km away from the nearest point P on a straight shoreline and its light makes four revolutions per minute.How fast is the beam of light moving along the shoreline when it is 1 km f
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一道国外的微分题目A lighthouse is located on a small island 2 km away from the nearest point P on a straight shoreline and its light makes four revolutions per minute.How fast is the beam of light moving along the shoreline when it is 1 km f
一道国外的微分题目
A lighthouse is located on a small island 2 km away from the nearest point P on a straight shoreline and its light makes four revolutions per minute.How fast is the beam of light moving along the shoreline when it is 1 km from (Round your answer to one decimal place.)

一道国外的微分题目A lighthouse is located on a small island 2 km away from the nearest point P on a straight shoreline and its light makes four revolutions per minute.How fast is the beam of light moving along the shoreline when it is 1 km f
这道微分题目 一座灯塔位于距直海岸线上的点 P最近,距离为 2 公里的一个小岛上,它的光线4圈 / 分钟.如果光束距离P点1 公里,速度是多少?(圈一个小数位的答案）.
如果我理解没错的话,答案应该是2圈/min 具体式子不太好表达

8派／min
tan角=X／3
derivative it
sec2 d角／dt=1／3 dx／dt

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