document.write( "Question 886190: . If cosθ + sinθ = 2 cosθ ,then cosθ − sinθ = ?
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\n" ); document.write( "A. 2 sinθ
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\n" ); document.write( "C. sinθ
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\n" ); document.write( "D. None of the above
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Algebra.Com's Answer #535753 by Edwin McCravy(20056) $\"\"$ $\"About$

You can put this solution on YOUR website!
cosθ + sinθ = 2cosθ
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document.write( "Add -cosθ to both sides of the equation\r\n" );
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document.write( " cosθ + sinθ = 2cosθ\r\n" );
document.write( "-cosθ          -cosθ\r\n" );
document.write( "--------------------\r\n" );
document.write( "        sinθ =  cosθ\r\n" );
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document.write( "Add -sinθ to both sides of the equation:\r\n" );
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document.write( "        sinθ =  cosθ\r\n" );
document.write( "       -sinθ = -sinθ\r\n" );
document.write( "       -------------\r\n" );
document.write( "           0 =  cosθ - sinθ \r\n" );
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document.write( "The answer is 0.  None of the above.\r\n" );
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document.write( "Edwin

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