Evaluate .

Answer and explanation

Correct answer: C.

  1. Step 1: Recall the standard integral: .
  2. Step 2: Here .
  3. Step 3: Substitute: .
Answer
\frac{1}{3}\arctan(\frac{x}{3}) + C.
Why not the others: '' is the integral of ; '' uses instead of ; '' forgets the leading coefficient .

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