C. -3sin 3x / -3sin 3x
ExplanationStep 1: Use chain rule and derivative of cos. Step 2: d/dx cos3x = -sin3x × 3 = -3sin3x. Step 3: Remember negative sign in derivative of cos.
Step 1: Chain rule और derivative of cos use करें। Step 2: d/dx cos3x = -sin3x × 3 = -3sin3x। Step 3: cos derivative में negative sign याद रखें।
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