document.write( "Question 1017962: Find the exact value by using a half-angle identity. \r
\n" ); document.write( "\n" ); document.write( "cosine of five pi divided by twelve.
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Algebra.Com's Answer #634216 by MathTherapy(10556)\"\" \"About 
You can put this solution on YOUR website!

\n" ); document.write( "Find the exact value by using a half-angle identity. \r
\n" ); document.write( "\n" ); document.write( "cosine of five pi divided by twelve.
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\"cos+%281%2F2%29A+=+%22+%22%2B-+sqrt%28%281+%2B+cos+%28A%29%29%2F2%29\"
\n" ); document.write( "\"cos+%28%285pi%29%2F12%29%29%29\", or \"cos+%281%2F2%29%28%285pi%29%2F6%29\" = +\"sqrt%28%281+%2B+cos+%28%285pi%29%2F6%29%29%2F2%29\" = \"sqrt%28%281+%2B+%28-+sqrt%283%29%2F2%29%29%2F2%29\" = \"sqrt%28%281+-+sqrt%283%29%2F2%29%2F2%29\" = \"sqrt%28%282%2F2+-+sqrt%283%29%2F2%29%2F2%29\" = \"sqrt%28%28%282+-+sqrt%283%29%29%2F2%29%2F2%29%29\" = \"sqrt%28%282+-+sqrt%283%29%29%2F4%29%29\" = \"highlight%28highlight_green%28highlight%28sqrt%282+-+sqrt%283%29%29%2F2%29%29%29\" \n" ); document.write( "
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