D. 4x^3
ExplanationStep 1: Apply the power rule. Step 2: d/dx x^n = n x^(n-1), so the answer is 4x^3. Step 3: The power becomes the coefficient and the exponent decreases by 1.
Step 1: Power rule लगाएँ। Step 2: d/dx x^n = n x^(n-1), इसलिए answer 4x^3 है। Step 3: Power नीचे coefficient बनती है और power 1 कम होती है।
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