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Solve the given problems by finding the appropriate derivative.The insulation resistance $R$ (in $\Omega / \mathrm{m}$ ) of a shielded cable is given by $R=k \ln \left(r_{2} / r_{1}\right) .$ Here $r_{1}$ and $r_{2}$ are the inner and outer radii of the insulation. Find the expression for $d R / d r_{2}$ if $k$ and $r_{1}$ are constant.
Calculus 1 / AB
Chapter 27
Differentiation of Transcendental Functions
Section 8
Applications
Derivatives
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