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Derivative of \( \displaystyle \left(x - \frac{1}{2}\right) e^{2 x} \)

Problem 2.182 · hard

Differentiate \( \displaystyle f(x) = \left(x - \frac{1}{2}\right) e^{2 x} \).
  1. \[ \frac{d}{d x} \left(x - \frac{1}{2}\right) e^{2 x} \]
    derivativeStart with the derivative of the function.✓ Proved
  2. \[ = \frac{d}{d x} x e^{2 x} - \frac{d}{d x} \frac{e^{2 x}}{2} \]
    sumApply the difference rule.✓ Proved
  3. \[ = \frac{d}{d x} x e^{2 x} - \frac{\frac{d}{d x} e^{2 x}}{2} \]
    constant-multiplePull out the constant factor.✓ Proved
  4. \[ = x \frac{d}{d x} e^{2 x} + e^{2 x} \frac{d}{d x} x - \frac{\frac{d}{d x} e^{2 x}}{2} \]
    productApply the product rule to the first term.✓ Proved
  5. \[ = x \frac{d}{d x} e^{2 x} + e^{2 x} - \frac{\frac{d}{d x} e^{2 x}}{2} \]
    derivativeDifferentiate x.✓ Proved
  6. \[ = 2 x e^{2 x} \]
    chain algebra simplifyApply the chain rule to the exponential terms. Simplify the coefficients. Combine like terms.✓ Proved
Answer \( 2 x e^{2 x} \)

✓ 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
3✓ Provedsympy 1.14.0simplify(a - b) reduced to 0
4✓ Provedsympy 1.14.0simplify(a - b) reduced to 0
5✓ Provedsympy 1.14.0simplify(a - b) reduced to 0
6✓ Provedsympy 1.14.0simplify(a - b) reduced to 0
7✓ Provedsympy 1.14.0simplify(a - b) reduced to 0
8✓ Provedsympy 1.14.0simplify(a - b) reduced to 0
answer✓ Provedsympy 1.14.0final line against the stated answer: simplify(a - b) reduced to 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: pass
  • qwen3.6:27b-mlx: pass — The solution correctly applies differentiation rules step-by-step, adhering to the one-change-per-step constraint and using valid labels from the fixed vocabulary.
Every verdict on record (15)
  • qwen3.6:27b-mlx: pass 2026-09-20 — The solution correctly applies differentiation rules step-by-step, adhering to the one-change-per-step constraint and using valid labels from the fixed vocabulary.
  • 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: pass 2026-09-19
  • gpt-oss:20b: pass 2026-09-19
  • qwen3.6:27b-mlx: pass 2026-09-19 — The solution correctly applies the sum, constant-multiple, product, and chain rules in separate steps. Each step changes only one aspect of the expression, and the labels accurately reflect the operations performed.
  • deepseek-r1:70b: pass 2026-09-19
  • gpt-oss:20b: pass 2026-09-19
  • qwen3.6:27b-mlx: pass 2026-09-18
  • deepseek-r1:70b: pass 2026-09-18
  • gpt-oss:20b: pass 2026-09-18
  • gpt-oss:20b: fail 2026-09-17 — Step 6 combines the chain rule with algebraic simplification (‑1/2·2·exp(2*x) → –exp(2*x)) in a single step, applying two rules at once, which could mislead a student.
  • deepseek-r1:70b: pass 2026-09-17

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.