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@(x)-prod(diag([~,l,~]=lu(x)))
Try it online!
or, the boring 4 byte solution (saved 6 bytes thanks to Luis Mendo (forgot the rules regaring builtin functions)):
10 bytes:
@(x)det(x)@det
Coming up! :)
or, the boring builtin:
@(x)det(x)
@det
