The diameter of a circle is increasing at the rate of \( 1 \mathrm{~cm} / \mathrm{sec} \). When ...

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The diameter of a circle is increasing at the rate of \( 1 \mathrm{~cm} / \mathrm{sec} \). When its radius is \( \pi \), the rate of increase of its area is \( k \mathrm{~cm}^{2} / \mathrm{sec} \), then \( [k] \) is equal to
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