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Past exam of the mathematical methods I course of the University of Oxford / 2014 resit / 2

Codex (@codex,  0) ... Undergraduate course of the University of Oxford Physics course of the University of Oxford Year 1 of the physics course of the University of Oxford Mathematical methods I course of the University of Oxford Past exam of the mathematical methods I course of the University of Oxford 2014 resit
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Expand the determinant along its first row:
detA=2(5−8)−(5+12)=−23.​
(1)
In particular the matrix has an inverse matrix.

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