document.write( "Question 1101917: what will be the determinant of
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Algebra.Com's Answer #716543 by ikleyn(52778) $\"\"$ $\"About$

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document.write( "Apply co-factoring the determinant along the first row of the matrix, and you will get\r\n" );
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document.write( "determinant = cos^2(x) - sin^2(x) = cos(2x).\r\n" );
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\n" ); document.write( "\n" ); document.write( "About co-factoring determinant see the lesson\r
\n" ); document.write( "\n" ); document.write( " - Co-factoring the determinant of a 3x3 matrix \r
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