document.write( "Question 698214: Verify the identity.\r
\n" ); document.write( "\n" ); document.write( "cos (x - y) - cos (x + y) = 2 sin x sin y
\n" ); document.write( " \n" ); document.write( "

Algebra.Com's Answer #430522 by solver91311(24713) $\"\"$ $\"About$

You can put this solution on YOUR website!
\r
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( "

\r
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( "

\r
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( "Make the substitutions in your LHS and collect like terms to derive your RHS.\r
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( "John
\n" ); document.write( "

\n" ); document.write( "Egw to Beta kai to Sigma
\n" ); document.write( "My calculator said it, I believe it, that settles it
\n" ); document.write( "

$\"The$

\n" ); document.write( " \n" ); document.write( "

\n" );