document.write( "Question 27854: Differentitate: \r
\n" ); document.write( "\n" ); document.write( "y=3+cos 2x \r
\n" ); document.write( "\n" ); document.write( "Is it -2 sin 2x?
\n" ); document.write( "Thanks .
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Algebra.Com's Answer #15168 by Sridi(6)\"\" \"About 
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Yes... you are right.
\n" ); document.write( "\"d%28y%29%2Fdx\" = \"d%2Fdx\" (3) + \"d%2Fdx\"(cos2x)\r
\n" ); document.write( "\n" ); document.write( "\"dy%2Fdx\" = 0 + (-2sin2x)\r
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