D. sin 3x / 3+C
ExplanationStep 1: Identify the concept: trigonometric integral. Step 2: The integral of cos(kx) is sin(kx)/k. The answer is sin 3x/3+C. Step 3: Exam tip: In trig integrals, divide by the coefficient.
Step 1: अवधारणा trigonometric integral है। Step 2: cos(kx) का integral sin(kx)/k होता है। Answer sin 3x/3+C। Step 3: याद रखें: Trig integral में coefficient से divide करें।
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