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Question -

The side of a square is increasing at the rate of 0.2 cm/sec. Find the rate of increase of the perimeter of the square.



Answer -

Given the side of a square is increasing at the rate of 0.2 cm/sec.
To find rate of increase of the perimeter of the square
Let the edge of the given cube be x cm at any instant time.
Then according to the given question, we can write as

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