What is the Jacobian of det???

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In some questions of submanifold, I want to use determinant as a $C^{\infty}$Map, and show that, for example, $det^{-1}\{-1\}$ is a submanifold of $M_{2n}(\mathbb{R})$(this may be not true). However, I don't know what (J(det)) is(the Jacobian of determinant). Could you teach me??