B. 2x
ExplanationStep 1: Identify the concept: this is derivative power rule. Step 2: d/dx of x^2 = 2x. Step 3: Remember derivative of x^n is n x^(n-1).
Step 1: concept पहचानें: यह derivative power rule है। Step 2: d/dx of x^2 = 2x होता है। Step 3: x^n का derivative n x^(n-1) याद रखें।
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