A spherical balloon is being inflated so that its volume increases at a constant rate of $36 π cm^{3} / s$ . Find the rate of increase of its radius when the radius is $3 cm$ .

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Find the derivative of $y = \frac{l n x}{x ^{2}}$ with respect to $x$ for $x > 0$ .
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A piece of wire of length $40 cm$ is bent into the shape of a sector of a circle of radius $r cm$ and angle $θ$ radians.…
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