document.write( "Question 1042104: Use a sum or difference formula to find the exact value of the following.\r
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Algebra.Com's Answer #657041 by ikleyn(52790)\"\" \"About 
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document.write( "\"sin%2813pi%2F18%29%2Acos%28pi%2F36%29+%2B+cos%28%2813pi%29%2F18%29%2Asin%28pi%2F36%29\" = \"sin%28%2813pi%29%2F18+%2B+pi%2F36%29\" = \"sin%28%2826pi%29%2F36+%2B+pi%2F36%29\" = \"sin%2827pi%2F36%29\" = \"sin%28%283pi%29%2F4%29\" = \"sqrt%282%29%2F2\".\r\n" );
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\n" ); document.write( "\n" ); document.write( "Regarding a sum or difference formula, see the lesson\r
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