Use Eq. (5) and a parametrization x = t and y = (t) to prove that the

Use Eq. (5) and a parametrization x = t and y = ƒ(t) to prove that the curvature of the graph of y = ƒ(x) is given by

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K(X) = [f"(x)] (1 + f'(x)) 3/2