A. 1 / x
ExplanationStep 1: Identify chain rule. Step 2: Derivative of log(2x) is (1/(2x))×2=1/x. so the correct option follows. Step 3: In exam questions apply the formula first.
Step 1: chain rule पहचानें। Step 2: log(2x) का derivative (1/(2x))×2=1/x है। इसलिए सही विकल्प मिलता है। Step 3: ऐसे प्रश्नों में पहले सूत्र लगाएँ।
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