B. 3x²
ExplanationStep 1: Identify power rule. Step 2: Power rule gives n x^(n-1), so the derivative is 3x². so the correct option follows. Step 3: In exam questions apply the formula first.
Step 1: power rule पहचानें। Step 2: power rule n x^(n-1) देता है इसलिए 3x² मिलता है। इसलिए सही विकल्प मिलता है। Step 3: ऐसे प्रश्नों में पहले सूत्र लगाएँ।
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