D. -3sin 3x
ExplanationStep 1: Identify chain rule. Step 2: By chain rule derivative of cos is -sin and derivative of 3x is 3. so the correct option follows. Step 3: In exam questions apply the formula first.
Step 1: chain rule पहचानें। Step 2: chain rule से cos का derivative -sin और 3x का derivative 3 है। इसलिए सही विकल्प मिलता है। Step 3: ऐसे प्रश्नों में पहले सूत्र लगाएँ।
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