Figure 28.4. The exponential function ex has a slope equal to its value. In other words, it satisfies the differential equation dn/dx = n. This is illustrated in the graph, which shows slopes of 1, 2, 4 when ex = 1, 2, 4, respectively. The shaded triangles illustrate the gradients at points where ex = 1, 2, 4. Recall that the slope dn/dx is the ratio between the vertical and horizontal edges of the triangles.
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