What is the volume of the solid generated by revolving the region enclosed by , , , and about the x-axis?
Answer and explanation
Correct answer: B.
- Step 1: Disk method formula: .
- Step 2: Integrand: .
- Step 3: Integrate: .
- Step 4: Multiply by : .
Answer
pi(e^2 - 1)/2.
Why not the others: '' forgets the factor ; '' integrates instead of its square.
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