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