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f(x) = 2x + 4 와 g(x) = (x-4)/2 가 역함수임을 확인하라( f \circ g 와 를 계산)
f(x) = 2x + 4 와 g(x) = (x-4)/2 가 역함수임을 확인하라( f \circ g 와 를 계산)
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