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[" If "f(x)=(x)/(sqrt(1+x^(2)))," then "...

[" If "f(x)=(x)/(sqrt(1+x^(2)))," then "(" fofof ")(x)=],[[" (1) "(3x)/(sqrt(1+x^(2)))," (2) "(x)/(sqrt(1+3x^(2)))],[" (3) "(3x)/(sqrt(1-x^(2)))," (4) None of these "]]

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