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PutnamSuperchallengeIntegrals I: Feynman's Trick

Integrals I: Feynman's Trick · Superchallenge problem

Compute the determinant of the 5×55\times5 circulant matrix whose first row is (9,9,1,4,8)(9, 9, 1, 4, 8) and whose each later row is the previous one shifted right by one.