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~ ~ ~ ~ ~ The Cardioid Envelope ~ ~ ~ ~ ~
~ ~ ~ ~ ~ ~ by Jarek Snuszka ~ ~ ~ ~ ~ ~ ~
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A=set(0,0.01,ldots*1)

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2*sin(pi*a)*vector(cos(2*pi*t),sin(2*pi*t))+vector(cos(2*pi*a),sin(2*pi*a)),in(a,A)

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Graph of the formula

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