$f: R \rightarrow R$ and $g: R \rightarrow R$ are two functions such that $f(x)=x^2$ and…

$f: R \rightarrow R$ and $g: R \rightarrow R$ are two functions such that $f(x)=x^2$ and $g(x)=\frac{1}{x^2}$, then $x^4(f \circ g)(x)$ is equal to
  1. 0
  2. 1
  3. $x^4$
  4. $x^2$

Solution

Given, $f(x)=x^2$ and $g(x)=1 / x^2$ $\begin{aligned} f \circ g(x) & =f(g(x))=\left(\frac{1}{x^2}\right)^2=\frac{1}{x^4} \\ \therefore \quad x^4 f \circ g(x) & =x^4 \times \frac{1}{x^4}=1\end{aligned}$

Asked in: AP EAMCET 2021 (24 Aug Shift 2)

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