document.write( "Question 1204746: Rewrite the product as a sum or difference.
\n" ); document.write( "2 sin(9x) cos(2x) \n" ); document.write( "

Algebra.Com's Answer #841202 by Edwin McCravy(20063) $\"\"$ $\"About$

You can put this solution on YOUR website!

\r\n" );
document.write( "\r\n" );
document.write( "You are probably more familiar with this more common formula than the \r\n" );
document.write( "general product-to-sum and sum-to-product formulas, so I prefer to use \r\n" );
document.write( "this more familiar one:\r\n" );
document.write( "\r\n" );
document.write( "\r\n" );
document.write( "\r\n" );
document.write( "\r\n" );
document.write( "\r\n" );
document.write( "\r\n" );
document.write( "\r\n" );
document.write( "Add the two equations:\r\n" );
document.write( "\r\n" );
document.write( "\r\n" );
document.write( "\r\n" );
document.write( "The left side is a sum.\r\n" );
document.write( "\r\n" );
document.write( "Edwin

\n" ); document.write( "

\n" );