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The locus of the middle points of the normal chords of the rectangular hyperbola is
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Correct option is A
Equation of the normal at (asec θ, atan θ) to the hyperbola x2−y2=a2 isaxsec θ+aytan θ=a2+a2=2a2 (1)Let (h, k) be the middle point of this normal then its equation ishx−ky−a2=h2−k2−a2 T=S1⇒ hx−ky=h2−k (2)Comparing (1) and (2) we gethsecθ=−ktanθ=h2−k22a⇒ secθ=h2−k22ah,tanθ=h2−k2−2ak So 1=sec2 θ−tan2 θ=h2−k224a21h2−1k2⇒ h2−k23+4a2h2k2=0 Locus of (h, k) is y2−x23=4a2x2y2Talk to our academic expert!
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