C. 14x-4
ExplanationStep 1: Identify sum rule. Step 2: Termwise derivative gives 14x and -4, so result is 14x-4. so the correct option follows. Step 3: In exam questions apply the formula first.
Step 1: sum rule पहचानें। Step 2: termwise derivative 14x और -4 है इसलिए 14x-4 मिलता है। इसलिए सही विकल्प मिलता है। Step 3: ऐसे प्रश्नों में पहले सूत्र लगाएँ।
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