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