Let S be the circle in the xy plane defined by the equation x2+y2=4Let 𝑃 be a point on the circle 𝑆 with both coordinates being positive. Let the tangent to 𝑆 at 𝑃 intersect the coordinate axes at the points 𝑀 and 𝑁. Then, the mid-point of the line segment 𝑀𝑁 must lie on the curve Let E1E2and F1F2be the chord of S passing through the point P01,1 and parallel to the x-axis and the y-axis, respectively. Let G1G2 be the chord of S passing through P0 and having slope –1. Let the tangents to S at E1and E2 meet at E3, the tangents of S at F1and F2 meet at F3, and the tangents to S at G1and G2meet at G3. Then, the points E3,F3 , and G3 lie on the curve
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