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Derivative of \( \displaystyle \frac{e^{2 x}}{2 x} \)

Problem 2.372 · hard

Differentiate \( \displaystyle f(x) = \frac{e^{2 x}}{2 x} \).
  1. \[ \frac{d}{d x} \frac{e^{2 x}}{2 x} \]
    rewriteStart with the derivative of the function. Rewrite the denominator using a negative exponent.✓ Proved
  2. \[ = e^{2 x} \frac{d}{d x} \frac{1}{2 x} + \frac{\frac{d}{d x} e^{2 x}}{2 x} \]
    productApply the product rule.✓ Proved
  3. \[ = e^{2 x} \frac{d}{d x} \frac{1}{2 x} + \frac{e^{2 x}}{x} \]
    chainDifferentiate the exponential term using the chain rule.✓ Proved
  4. \[ = \frac{e^{2 x}}{x} - \frac{e^{2 x}}{2 x^{2}} \]
    chain algebra algebra simplifyDifferentiate the power term using the chain rule. Simplify the terms using exponent rules. Simplify the coefficients. Simplify the fraction.✓ Proved
  5. \[ = \frac{2 x e^{2 x} - e^{2 x}}{2 x^{2}} \]
    algebraCombine the terms over a common denominator.✓ Proved
  6. \[ = \frac{\left(2 x - 1\right) e^{2 x}}{2 x^{2}} \]
    simplifyFactor out the exponential term.✓ Proved
Answer \( \frac{\left(x - \frac{1}{2}\right) e^{2 x}}{x^{2}} \)

✓ 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
6✓ Provedsympy 1.14.0simplify(a - b) reduced to 0
undefined where x = 0
7✓ Provedsympy 1.14.0simplify(a - b) reduced to 0
undefined where x = 0
8✓ Provedsympy 1.14.0simplify(a - b) reduced to 0
undefined where x = 0
9✓ Provedsympy 1.14.0simplify(a - b) reduced to 0
undefined where x = 0
10✓ Provedsympy 1.14.0simplify(a - b) reduced to 0
undefined where x = 0
answer✓ Provedsympy 1.14.0final line against the stated answer: simplify(a - b) reduced to 0
undefined where x = 0
answer, a second way✓ Provedsympy 1.14.0SymPy differentiated f directly and got the stated answer

Reviewers

  • gpt-oss:20b: pass
  • deepseek-r1:70b: fail (error) — Step 1 lacks a rule label, violating the contract.
  • qwen3.6:27b-mlx: pass — The solution correctly applies the product rule and chain rule in separate steps. The algebraic simplifications are valid and lead to the correct final answer.
Every verdict on record (10)
  • qwen3.6:27b-mlx: pass 2026-09-20 — The solution correctly applies the product rule and chain rule in separate steps. The algebraic simplifications are valid and lead to the correct final answer.
  • gpt-oss:20b: pass 2026-09-20
  • qwen3.6:27b-mlx: pass 2026-09-20
  • gpt-oss:20b: pass 2026-09-20
  • qwen3.6:27b-mlx: pass 2026-09-19
  • deepseek-r1:70b: fail (error) 2026-09-19 — Step 1 lacks a rule label, violating the contract.
  • gpt-oss:20b: pass 2026-09-19
  • qwen3.6:27b-mlx: pass 2026-09-19 — The solution correctly applies the product rule and chain rule in separate steps, adhering to the one-change-per-step constraint. The labels used are appropriate for the operations performed.
  • deepseek-r1:70b: pass 2026-09-19
  • gpt-oss:20b: pass 2026-09-19

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 2026-09-26 with SymPy 1.14.0.