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Textbook Expert
Textbook ExpertVerified Tutor
11 Nov 2021

Given information

The length of a rectangle is increasing at a rate of  and its width is increasing at a rate of .

That is,

 

The length is  and the width is .

Step-by-step explanation

Step 1.

The area of the rectangle is:

 

Differentiate on both sides:

 

Substitute :

 

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