Given; Circles touching the y-axis at the origin.
∴ Center of the circles are given by (r,0); ‘r’ is the radius.
The equation of these circles is;
(x − r)2 + (y − 0)2 = r2
∴ x2 + y2 − 2rx = 0
Differentiating w.r.t x; we get
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