AIR MATH

Math Question

If \( f(x)=3 x \) and \( g(x)=\frac{1}{3} x \), which expression could be used to verify that \( g(x) \) is the inverse of \( f(x) \) ? \( 3 x\left(\frac{x}{3}\right) \) \( \left(\frac{1}{3} x\right)(3 x) \) \( \frac{1}{3}(3 x) \) \( \frac{1}{3}\left(\frac{1}{3} x\right) \)

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