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Flowers for Fourier

Flowers for Fourier is from 99 Points of Intersection by Hans Walser, published by the Mathematical Association of America (June 15, 2006)

A 5-petaled flower

A 7-petaled flower

An 11-petaled flower

Intersections of the Flowers

Other Flowers With These Intersection Points

Each of these polar graph equations have the form . They will intersect in the on the same circle and equilateral triangle.

Behind These Graphs

Behind the polar graphs are the functions y = cos(5t), y = cos(7t), and y = cos(11t). These all have the form  . These functions all pass through the points (0, 1), (-π/2, 0.5) and (π/2, 0.5) on the interval [-π, π].