Evaluate the definite integral: .

Answer and explanation

Correct answer: A.

- Lower:
- Upper:
  1. Step 1: Use -substitution: let , then .
  2. Step 2: Convert the limits:
  3. Step 3: Rewrite the integral: .
Answer
.
Why not the others: '1' integrates without dividing by 3; '1/2' uses power 1 instead of power 2; '' forgets to convert limits to .

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