[微分] 請問一下這題要怎麼解呢
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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