Class 12 Integrals · Mcq Single Correct1 Markssubstitution
Class 12 Maths · Integrals · Mcq Single Correct #125
Evaluate \(\int_1^3 3\cos(\ln x)/x\,dx\).
✅ Step-by-Step Solution
Final Answer: Option (A): 3sin(ln3)
- Let u=ln x, du=dx/x, with limits 0,ln3. Then I=3[sin u]₀^(ln3)=3sin(ln3).
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