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CHOOSE the correct answer from the following alternative : the rate of incrse of a side of a square is 1cm/sec. the rate of increase of area of the square, when length os a side of the square is 2 cm , is -

A

`frac {4cm^2}{sec}`

B

`frac {8cm^2}{sec}`

C

`frac {1cm^2}{sec}`

D

`frac {2cm^2}{sec}`

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