Identify the inverse function of f(x)=3xf(x) = 3^xf(x)=3x.
f−1(x)=13xf^{-1}(x) = \frac{1}{3^x}f−1(x)=3x1
f−1(x)=x3f^{-1}(x) = \sqrt[3]{x}f−1(x)=3x
f−1(x)=log3(x)f^{-1}(x) = \log_3(x)f−1(x)=log3(x)
f−1(x)=x3f^{-1}(x) = x^3f−1(x)=x3