The lemniscate curve (x2 + y2)2 = 4(x2 y2) was discovered by Jacob Bernoulli in 1694
Chapter 3, Problem 86(choose chapter or problem)
The lemniscate curve (x2 + y2)2 = 4(x2 y2) was discovered by Jacob Bernoulli in 1694, who noted that it is shaped like a figure 8, or a knot, or the bow of a ribbon. Find the coordinates of the four points at which the tangent line is horizontal (Figure 18).
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