Let be the angle in Figure 16, where P = (x, (x)). In the setting of the previous exercise, show that Differentiate tan

Let θ be the angle in Figure 16, where P = (x, ƒ (x)). In the setting of the previous exercise, show that

Differentiate tan θ = ƒ(x)/x and observe that cos θ = x/√x² + ƒ(x)².

de dt || xf'(x) - f(x) dx x + f(x) dt