\( \definecolor{colordef}{RGB}{249,49,84} \definecolor{colorprop}{RGB}{18,102,241} \)
Write the equation of the tangent line to the graph of \(g : ]0, +\infty[ \to \mathbb{R}\), \(g(y) = \sqrt{y}\), at the point \((4, 2)\) by applying the inverse-map derivative formula to \(f(x) = x^2\) on \([0, +\infty[\).
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