作者Etienne (真是够了)
看板trans_math
标题[微分] 请问一下这题要怎麽解呢
时间Thu Nov 13 07:17:46 2008
A man 6 feet tall walks at a rate of 5 feet per second
away from a light that is 15 feet above the ground.
When he is 10 feet from the base of the light,
(a)at what rate is the tip of his shadow moving?
(b)at what rate is the length of his shadow changing?
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