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[" 3.Find the rate of change of the area...

[" 3.Find the rate of change of the area of a circle with respect to its radius when the radius "],[" is "6cm" ."],[" I he radius of a spherical soap buble is increasing at the rate of "0.2cm/sec" .Find the "],[" rate of increase of its surface area,when the radius is "7cm" ."]

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