document.write( "Question 1025685: Write the expression as a sum or difference of trigonometric functions:\r
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Algebra.Com's Answer #640983 by Edwin McCravy(20059) $\"\"$ $\"About$

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The other tutor doesn't understand. Here's what you want:
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document.write( "2sin(35°)cos(84°)\r\n" );
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document.write( " sin(35°+84°) = sin(35°)cos(84°)+cos(35°)sin(84°)\r\n" );
document.write( " sin(35°-84°) = sin(35°)cos(84°)-cos(35°)sin(84°)\r\n" );
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document.write( "Simplify the left sides:\r\n" );
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document.write( "sin(35°+84°)= sin(119°) = sin(180°-61°) = sin(61°)\r\n" );
document.write( "sin(35°-84°)= sin(-49°) = -sin(49°) \r\n" );
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document.write( "         sin(61°) =  sin(35°)cos(84°)+cos(35°)sin(84°)\r\n" );
document.write( "        -sin(49°) =  sin(35°)cos(84°)-cos(35°)sin(84°)\r\n" );
document.write( "---------------------------------------------\r\n" );
document.write( "sin(61°)-sin(49°) = 2sin(35°)cos(84°) \r\n" );
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document.write( "The right side is what we were given:\r\n" );
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document.write( "Answer: sin(61°)-sin(49°)\r\n" );
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document.write( "Edwin

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