Evaluate using repeated integration by parts.

Answer and explanation

Correct answer: B. obtained after two reduction steps

  1. Step 1: First step: . Second step: . Substituting back gives . **Answer: obtained after two reduction steps. Why not the others:** " single integration" integrates only once, evaluating rather than ; " arithmetic slip" makes an arithmetic error in distributing the factor of across ; " upper boundary term" neglects the integral terms entirely, keeping only the boundary product .

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