document.write( "Question 1130748: Find the derivative of tan (x + y) + tan (x - y) = x \n" ); document.write( "
Algebra.Com's Answer #747358 by Alan3354(69443)\"\" \"About 
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Find the derivative of tan (x + y) + tan (x - y) = x
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\n" ); document.write( "It's an equation.
\n" ); document.write( "Confirm you want the derivative.
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