MathCastle
PutnamSuperchallengeIntegrals I: Feynman's Trick

Integrals I: Feynman's Trick · Superchallenge problem

Compute the determinant of the 3×33\times3 circulant matrix whose first row is (2,2,1)(2, 2, 1) and whose each later row is the previous one shifted right by one.