document.write( "Question 909273: Let \"+f%28x%29+=+cos%28x%29+%2B+sin+%28x%29+\"\r
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Algebra.Com's Answer #551756 by Alan3354(69443)\"\" \"About 
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Let \"+f%28x%29+=+cos%28x%29+%2B+sin+%28x%29+\"\r
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\n" ); document.write( "Find f'(x)
\n" ); document.write( "Then f'(pi/4)
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\n" ); document.write( "If you can't do that, you're in the wrong class.
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