∫Calc Practice

Integral of \( \displaystyle 2 x + \frac{1}{2 x} \)

Problem 4.275 · medium

Find \( \displaystyle \int 2 x + \frac{1}{2 x} \, dx \). (Omit the constant of integration.)
  1. \[ \int \left(2 x + \frac{1}{2 x}\right)\, dx \]
    integralStart with the integral of the given expression.✓ Proved
  2. \[ = \int \frac{1}{2 x}\, dx + \int 2 x\, dx \]
    linearity algebraSplit the integral into two parts using linearity. Factor out the constant 1/2 from the second term.✓ Proved
  3. \[ = \frac{\int \frac{1}{x}\, dx}{2} + 2 \int x\, dx \]
    algebraFactor out the constant 2 from the first term.✓ Proved
  4. \[ = x^{2} + \frac{\ln{\left(x \right)}}{2} \]
    antiderivativeEvaluate the integrals of x and 1/x.✓ Proved
Answer \( x^{2} + \frac{\ln{\left(x \right)}}{2} + C \)

✓ Nihil obstat Every line of this solution was proved by the computer algebra system SymPy. The answer was also checked a second way, without looking at the solution. Reviewers found nothing wrong with the explanation.

The full receipt
LineStatusChecked byDetail
1✓ Provedsympy 1.14.0line 1 is the problem as stated
2✓ Provedsympy 1.14.0simplify(a - b) reduced to 0
undefined where x = 0
3✓ Provedsympy 1.14.0simplify(a - b) reduced to 0
undefined where x = 0
4✓ Provedsympy 1.14.0simplify(a - b) reduced to 0
undefined where x = 0
5✓ Provedsympy 1.14.0simplify(a - b) reduced to 0
undefined where x = 0
log is undefined for non-positive arguments
answer✓ Provedsympy 1.14.0final line against the stated answer: simplify(a - b) reduced to 0
log is undefined for non-positive arguments
answer, a second way✓ Provedsympy 1.14.0SymPy differentiated the stated antiderivative back to the integrand

Reviewers

  • gpt-oss:20b: pass
  • qwen3.6:27b-mlx: pass
Every verdict on record (4)
  • qwen3.6:27b-mlx: pass 2026-10-04
  • gpt-oss:20b: pass 2026-10-04
  • qwen3.6:27b-mlx: pass 2026-10-04
  • gpt-oss:20b: pass 2026-10-04

Proved: SymPy reduced the difference between the two sides to zero. Checked independently: a separate method, named above, confirmed it. Checked numerically: the two sides agree at every sampled point, which is evidence, not proof. Reviewed: a model or a person read it; that is all a sentence can have. Solution by gemma4:26b, checked 2026-10-04 with SymPy 1.14.0.