B. -1 / x²
ExplanationStep 1: Identify power rule. Step 2: 1/x=x⁻¹ and power rule gives -x⁻²=-1/x². so the correct option follows. Step 3: In exam questions apply the formula first.
Step 1: power rule पहचानें। Step 2: 1/x=x⁻¹ और power rule से -x⁻²=-1/x² मिलता है। इसलिए सही विकल्प मिलता है। Step 3: ऐसे प्रश्नों में पहले सूत्र लगाएँ।
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