Many equations can be expressed in the form \[\begin{equation*}f(x) = \phi(x), \tag{1}\end{equation*}\] where \(f(x)\) and \(\phi(x)\) are functions whose graphs are easy to draw. And if the curves \[y = f(x),\quad y = \phi(x)\] intersect in a point \(P\) whose abscissa is \(\xi\), then \(\xi\) is a root of the equation (1).

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