document.write( "Question 326427: cos^2 5x-sin^2 5x=cos10x \n" ); document.write( "
Algebra.Com's Answer #233703 by Fombitz(32388)\"\" \"About 
You can put this solution on YOUR website!
\"cos%2810x%29+=+cos%285x%2B5x%29\"
\n" ); document.write( "\"cos%2810x%29=cos%285x%29cos%285x%29-sin%285x%29sin%285x%29\"
\n" ); document.write( "\"cos%2810x%29=%28cos%285x%29%29%5E2-%28sin%285x%29%29%5E2\"\r
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