document.write( "Question 738988: Use an Addition or Subtraction Formula to find the exact value of the expression
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document.write( "Sin(165) \n" );
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Algebra.Com's Answer #450975 by lwsshak3(11628)![]() ![]() ![]() You can put this solution on YOUR website! Use an Addition or Subtraction Formula to find the exact value of the expression \n" ); document.write( "Sin(165) \n" ); document.write( "*** \n" ); document.write( "sin(165)=sin(135+30) \n" ); document.write( "=(sin(135)cos(30))+(cos(135)sin(30)) \n" ); document.write( "=(√2/2*√3/2)+(-√2/2*1/2) \n" ); document.write( "=√6/4-√2/4 \n" ); document.write( "=(√6-√2)/4 \n" ); document.write( "calculator check: \n" ); document.write( "sin(165)≈0.2588.. \n" ); document.write( "(√6-√2)/4≈0.2588.. \n" ); document.write( " |