document.write( "Question 984732: Use a sum or difference formula to find the exact value of the following. \r
\n" ); document.write( "\n" ); document.write( "sin(6π/7)cos(3π/28) - cos(6π/7)sin(3π/28) = ? \n" ); document.write( "

Algebra.Com's Answer #605522 by jim_thompson5910(35256) $\"\"$ $\"About$

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sin(6π/7)cos(3π/28) - cos(6π/7)sin(3π/28)\r
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\n" ); document.write( "\n" ); document.write( "sin(24π/28-3π/28) ... use the identity sin(A-B) = sin(A)cos(B) - cos(A)sin(B)\r
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\n" ); document.write( "\n" ); document.write( "sin(21π/28)\r
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\n" ); document.write( "\n" ); document.write( "sin(3π/4)\r
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\n" ); document.write( "\n" ); document.write( "sqrt(2)/2 ... use the unit circle\r
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\n" ); document.write( "\n" ); document.write( "-------------------------------------------------------\r
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\n" ); document.write( "\n" ); document.write( "Final Answer: $\"sqrt%282%29%2F2\"$
\n" ); document.write( "Note: the '2' in the denominator is NOT inside the square root \n" ); document.write( "

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