Trisectrix of Maclaurin

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The Trisectrix of Maclaurin for a=1
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The Trisectrix of Maclaurin for a=1

The trisectrix of Maclaurin is a plane curve with equation

y2 = x2(3a + x) / (ax)

or, in polar coordinates,

r = asecθ − 4acosθ