Locus of the midpoints of the portion of the line xsinθ+ycosθ=p intercepted between the axes is ____.

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Given  equation  of  the  line  is         xcosθ+ysinθ=p                                        …(i)Let  C(h,k)  be  the  mid  of  the  given  line  AB  where  it  meets  the  two  axis  atA(a,0)  and  B(0,b).  (a,0)  lies  on  eqn.(i)  then        acosθ+0=p⇒        a=pcosθ                                                        …(ii)B(0,b)  also  lies  on  eqn.(i)  then         0+bsinθ=p⇒        b=psinθ                                                        …(iii)  C(h,k)  is  the  mid  of  AB∴          h=0+a2      ⇒a=2hand     k=b+02      ⇒b=2kPutting  the  values  of  a  and  b  is  eqn.(ii)  and  (iii)  we  get           2h=pcosθ    ⇒cosθ=p2h                          …(iv)and   2k=psinθ    ⇒sinθ=p2k                            …(v)Squaring  and  adding  eqn.(iv)  and  (v)  we  get    cos2θ+sin2θ=p24h2+p24k2⇒                          1=p24h2+p24k2So,  the  locus  of  the  mid  is                               1=p24x2+p24y2⇒               4x2y2=p2(x2+y2)Hence,  the  value  of  the  filler  is   4x2y2=p2(x2+y2).

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Maths NCERT Exemplar Solutions Class 11th Chapter Ten 2025

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