document.write( "Question 738988: Use an Addition or Subtraction Formula to find the exact value of the expression
\n" ); document.write( "Sin(165)
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Algebra.Com's Answer #450975 by lwsshak3(11628)\"\" \"About 
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Use an Addition or Subtraction Formula to find the exact value of the expression
\n" ); document.write( "Sin(165)
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\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..
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