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Chord of contact:

Equation of chord of contact can be given by T = 0, where T = 1708_Chord of contact.png.

Illustration: From the point O on the circle x2 + y2 = 25, tangents OP and OQ are drawn to ellipse 1738_Chord of contact1.png Show that the locus of midpoint of the chord PQ describes curve x1491_Chord of contact2.png.                                                                                                               

Solution:               O ≡  (5 cosθ,  5 sinθ)

                              Suppose R be middle point of PQ. Let R ≡ (h, k) .

                              Equation of chord of contact PQ is T = 0

                              i.e. 297_Chord of contact4.png       

                              Equation of chord PQ having middle point R(h, k) is

                             351_Chord of contact5.png

    329_Chord of contact3.png                             

                              (1) and (2) are  the same  equations.

                              798_Chord of contact6.png                    

                              Thus locus of (h, k)  is  1862_Chord of contact7.png  

 

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