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