D. 3sin x+C
ExplanationStep 1: Identify constant multiple integration. Step 2: Take 3 outside and use ∫cos x dx=sin x. so the correct option follows. Step 3: In exam questions apply the formula first.
Step 1: constant multiple integration पहचानें। Step 2: 3 constant बाहर और ∫cos x dx=sin x है। इसलिए सही विकल्प मिलता है। Step 3: ऐसे प्रश्नों में पहले सूत्र लगाएँ।
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