602. [L<sup>1</sup>. 14. a.] A triangle is circumscribed about the parabola y<sup>2</sup>=4ax, and two of its vertices move on the confocal <i>y</i><sup>2</sup>= 4(<i>α</i> + <i>λ</i>)(<i>x</i> + <i>λ</i>). To find the locus of the third vertex
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