document.write( "Question 1137787: Prove that cos35 + cos45 + cos75 + cos85 = 2cos5cos20 \n" ); document.write( "
Algebra.Com's Answer #755698 by Alan3354(69443) You can put this solution on YOUR website! Using a calculator, they are equal. \n" ); document.write( "------------ \n" ); document.write( "I don't plan to do any more on this one. \n" ); document.write( " \n" ); document.write( " |