A. 1/x / 1/x
ExplanationStep 1: Apply chain rule for logarithm. Step 2: d/dx ln(3x) = (1/3x)×3 = 1/x. Step 3: Derivative of ln(kx) is 1/x.
Step 1: Chain rule for logarithm लगाएं। Step 2: d/dx ln(3x) = (1/3x)×3 = 1/x। Step 3: ln(kx) का derivative 1/x होता है।
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