document.write( "Question 842200: what is the domain of the function f(x) = 2x/(x^2+1) \n" ); document.write( "
Algebra.Com's Answer #507427 by LinnW(1048)\"\" \"About 
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Since for any value of x, either positive or negative, the denominator
\n" ); document.write( "will be a positive number, this makes the domain of the function all real
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