If $f(x)=x+7$ and $g(x)=x-7, x \in R$, find (fog) (7).
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If $f(x)=x+7$ and $g(x)=x-7, x \in R$, find (fog) (7).

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SOLUTION : $\text { Here } f(x)=x+7, g(x)=x-7 \\$

$(f \circ g) x=f(g(x))=f(x-7)=x-7+7=x \\$

$\therefore(f \circ g)(7)=7$

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