
\n" );
document.write( "\r\n" );
document.write( "Write the
in the left side as
\r\n" );
document.write( "\r\n" );
document.write( "
\r\n" );
document.write( "\r\n" );
document.write( "Put parentheses around
\r\n" );
document.write( "\r\n" );
document.write( "
\r\n" );
document.write( "\r\n" );
document.write( "Use the identity
\r\n" );
document.write( "using
,
\r\n" );
document.write( "or
\r\n" );
document.write( "to replace what we just put in parentheses:\r\n" );
document.write( "\r\n" );
document.write( "
\r\n" );
document.write( " \r\n" );
document.write( "
\r\n" );
document.write( "\r\n" );
document.write( "Now use that same identity again,
,\r\n" );
document.write( "this time using
,
\r\n" );
document.write( "or
to replace the left side:\r\n" );
document.write( "\r\n" );
document.write( "
\r\n" );
document.write( "\r\n" );
document.write( "Edwin
\n" );
document.write( "