document.write( "Question 1137994: If cos A = 1/3 , find sin (A/2) if ∠A is ACUTE. \n" ); document.write( "
Algebra.Com's Answer #755882 by ikleyn(52790)\"\" \"About 
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document.write( "Use trigonometric formula of half argument\r\n" );
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document.write( "    \"sin%28A%2F2%29\" = \"sqrt%28%281-cos%28A%29%29%2F2%29\".\r\n" );
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document.write( "Substitute here cos(A) = \"1%2F3\".  You will get\r\n" );
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document.write( "    \"sin%28A%2F2%29\" = \"sqrt%28%281-1%2F3%29%2F2%29\" = \"sqrt%28%28%282%2F3%29%29%2F2%29\" = \"sqrt%281%2F3%29\" = \"sqrt%283%29%2F3\".     ANSWER\r\n" );
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\n" ); document.write( "\n" ); document.write( "On trigonometric formulas see the lessons\r
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