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If f(x) = x + 7 and g(x) = x – 7, x ∈ R, then find fog (7).

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If f(x) = x + 7 and g(x) = x – 7, x ∈ R, then find fog (7).

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fog (x) = f(g(x)) 

= f(x – 7) = x – 7 + 7 = x

Therefore, fog(7) = 7

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