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$If f (x) = \frac{x}{\sqrt{(1 + x^{2})}}, then (fofof) (x) =$

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3x1+x2

x1+3x2

3x1−x2

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Correct option is B

fx=x1+x2 ⇒ffx=fx1+x2=x1+x21+x21+x2=x2x2+1⇒fffx= fx2x2+1=x2x2+11+x22x2+1=x3x2+1

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If f(x)=x1+x2, then ( fofof )(x)=

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$If f (x) = \frac{x}{\sqrt{(1 + x^{2})}}, then (fofof) (x) =$