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Question 3690: Complete Ascending Derivative Coefficients of a Sum

On this page
  1. Original question and givens
  2. Definition and scope
  3. Step-by-step derivation
  4. Reverse checks
  5. Result
  6. This question review and source binding

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← Question derivation index · Original question batch

R0006-03690 · q-20261007-advance-20261009-r04-derivative-rules-0090

Original question and givens

On all R, f has ascending coefficients [1, 14, 16, 3], constant term first and g has ascending coefficients [-1, 1, 1, 1], constant term first. Give the complete normalized ascending integer coefficients of (f+g)′.

  • G001 — On all R, f has ascending coefficients [1, 14, 16, 3], constant term first and g has ascending coefficients [-1, 1, 1, 1], constant term first. Give the complete normalized ascending integer coefficients of (f+g)′.

Definition and scope

Use the original question domain, assumptions and cited MKO definitions. This item has second-context mathematical and bilingual review, with the model, answer and every arithmetic step independently recomputed from the original parameters; the source question remains a candidate.

Step-by-step derivation

S001 · implies

Before

f ascending coefficients=[1, 14, 16, 3]

After

real polynomials are differentiable;use coefficient identities

Conditions: none

Coefficient k multiplies x^k;real polynomials differentiate termwise and constants have derivative0.Coefficient identities and a candidate comparison at one point are different claims.

Step identifiers and dependencies

Rule: polynomial_derivative_premise · Uses: G001

S002 · calculation

Before

f′ coefficient at degree0 := mul(1, 14)

After

f′ coefficient at degree0 = 14

Conditions: none

Multiply by the original degree and lower it by1;the constant term differentiates to0.

Step identifiers and dependencies

Rule: exact_rational_arithmetic · Uses: G001, S001

S003 · calculation

Before

f′ coefficient at degree1 := mul(2, 16)

After

f′ coefficient at degree1 = 32

Conditions: none

Multiply by the original degree and lower it by1;the constant term differentiates to0.

Step identifiers and dependencies

Rule: exact_rational_arithmetic · Uses: G001, S002

S004 · calculation

Before

f′ coefficient at degree2 := mul(3, 3)

After

f′ coefficient at degree2 = 9

Conditions: none

Multiply by the original degree and lower it by1;the constant term differentiates to0.

Step identifiers and dependencies

Rule: exact_rational_arithmetic · Uses: G001, S003

S005 · calculation

Before

g′ coefficient at degree0 := mul(1, 1)

After

g′ coefficient at degree0 = 1

Conditions: none

Multiply by the original degree and lower it by1;the constant term differentiates to0.

Step identifiers and dependencies

Rule: exact_rational_arithmetic · Uses: G001, S004

S006 · calculation

Before

g′ coefficient at degree1 := mul(2, 1)

After

g′ coefficient at degree1 = 2

Conditions: none

Multiply by the original degree and lower it by1;the constant term differentiates to0.

Step identifiers and dependencies

Rule: exact_rational_arithmetic · Uses: G001, S005

S007 · calculation

Before

g′ coefficient at degree2 := mul(3, 1)

After

g′ coefficient at degree2 = 3

Conditions: none

Multiply by the original degree and lower it by1;the constant term differentiates to0.

Step identifiers and dependencies

Rule: exact_rational_arithmetic · Uses: G001, S006

S008 · calculation

Before

sum derivative coefficient0 := sum(14, 1)

After

sum derivative coefficient0 = 15

Conditions: none

Add derivative coefficients of the same degree,using0 for a missing high-degree term.

Step identifiers and dependencies

Rule: exact_rational_arithmetic · Uses: G001, S007

S009 · calculation

Before

sum derivative coefficient1 := sum(32, 2)

After

sum derivative coefficient1 = 34

Conditions: none

Add derivative coefficients of the same degree,using0 for a missing high-degree term.

Step identifiers and dependencies

Rule: exact_rational_arithmetic · Uses: G001, S008

S010 · calculation

Before

sum derivative coefficient2 := sum(9, 3)

After

sum derivative coefficient2 = 12

Conditions: none

Add derivative coefficients of the same degree,using0 for a missing high-degree term.

Step identifiers and dependencies

Rule: exact_rational_arithmetic · Uses: G001, S009

S011 · implies

Before

[15, 34, 12]

After

complete derivative coefficient identity;zero polynomial=[0]

Conditions: none

The sum rule gives(f+g)′=f′+g′.Removing trailing zeros preserves the polynomial;retain[0] for zero.This is not coefficient inference from a few sample points.

Step identifiers and dependencies

Rule: sum_rule_coefficient_identity · Uses: G001, S010

Reverse checks

  • S011 · premise_and_result_audit — Check against the original data and this step's premises; a one-way implication is not an equivalence.
  • S010 · premise_and_result_audit — Recompute sum derivative coefficient2 with exact rational arithmetic, not rounded decimals.
  • S009 · premise_and_result_audit — Recompute sum derivative coefficient1 with exact rational arithmetic, not rounded decimals.
  • S008 · premise_and_result_audit — Recompute sum derivative coefficient0 with exact rational arithmetic, not rounded decimals.
  • S007 · premise_and_result_audit — Recompute g′ coefficient at degree2 with exact rational arithmetic, not rounded decimals.
  • S006 · premise_and_result_audit — Recompute g′ coefficient at degree1 with exact rational arithmetic, not rounded decimals.
  • S005 · premise_and_result_audit — Recompute g′ coefficient at degree0 with exact rational arithmetic, not rounded decimals.
  • S004 · premise_and_result_audit — Recompute f′ coefficient at degree2 with exact rational arithmetic, not rounded decimals.
  • S003 · premise_and_result_audit — Recompute f′ coefficient at degree1 with exact rational arithmetic, not rounded decimals.
  • S002 · premise_and_result_audit — Recompute f′ coefficient at degree0 with exact rational arithmetic, not rounded decimals.
  • S001 · premise_and_result_audit — Check against the original data and this step's premises; a one-way implication is not an equivalence.

Result

[15, 34, 12]

The full substitutions and premise checks give the original answer; source identity,format and status are unchanged.

This question review and source binding

Review date: 2026-10-26

Original questions, answers, step expressions, numeric ASTs and historical records are retained. Source candidate labels remain historical and are not overwritten as formal proof.

Source hashes and review receipts
  • input commit: 0f7be61e2c22317a4075561dc822c87d881a50db
  • original question SHA-256: b1cbc7056dfb41c619e1c170662a54a7d99cd397fe2cb66dcb02eecb3af30a8e
  • candidate record SHA-256: 9e40385cf2b97c1447803c23f8f3447129a61647268419a5ee9ee81913de9e28
  • semantic review receipt SHA-256: 568eefd71709ac3dc16a0d5b3b4ad3e83376a8ef300c9e5493eee0721500b29d
  • question-first witness SHA-256: d964b91bedb9d4918bbc055f567762a09f5a58af6c876268e719d5100332d855
  • Lean: NOT_RUN · human review: NOT_PERFORMED
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