Determinant of 2 transpose matrix A and B.

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Can you show me why $\det(A^T B^T) = \det(A)\det(B^T) = \det(A^T)\det(B)$ ?

im really having a hard time finding its properties. i dont know what to search. please help.

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The only result you need here is that $\det(A)=\det(A^T)$ and that $A^T B^T = (BA)^T$.