B. -sin x
ExplanationStep 1: Identify trigonometric derivative. Step 2: The derivative of cos x is -sin x. so the correct option follows. Step 3: In exam questions apply the formula first.
Step 1: trigonometric derivative पहचानें। Step 2: cos x का derivative -sin x होता है। इसलिए सही विकल्प मिलता है। Step 3: ऐसे प्रश्नों में पहले सूत्र लगाएँ।
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