A point P(x,y) moves along the curve y = x e^(-x/4)
in the first quadrant. Its x-coordinate moves at the rate 2 units/s to the right. Perpendiculars are dropped from P to both axes so as to form a rectangle with the axes. When x = 4,
(a) what is the rate of change of the y-coordinate of P?
(b) how fast is the area of the rectangle changing?
Differentiation-rate of change
2009-01-10 9:48 am
回答 (1)
2009-01-10 9:51 pm
✔ 最佳答案
The answer is as follows:圖片參考：http://i320.photobucket.com/albums/nn347/old-master/090110_mat_2.jpg?t=1231566613
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