Given a square matrix, you can find its determinant by using the determinant function available through SHIFT 4 7. SHIFT 4 brings up the matrix menu, and 7 selects the determinant function.
Refer to the "Matrix Calculations" section in the manual, beginning on page E-57, and items #096-105 in the appendix. If you've misplaced your manual and/or appendix, you can download them from
http://support.casio.com/manualfile.php?rgn=1&cid=004001004
In order to determine the opposite direction, you should simply add 180 degrees to your current bearing.
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