Rectangular hyperbola:
The equation of rectangular hyperbola referred to its transverse and conjugate axes as coordinate axes is thus x2 - y2 = a2.
Illustration : If tangent and normal to a rectangular hyperbola cut off intercepts a1 and a2 on one axis, and b1 and b2 on the other, show that a1a2 + b1b2 = 0.
Solution: Let rectangular hyperbola be x2 - y2 = a2 and let (asecΦ, a tanΦ) be any point on this hyperbola. The equations of t angents and normals at this point are
x secΦ, a tanΦ = a .....(i)
and xcosΦ + ycotΦ = 2a ...(ii)
as (i) and (ii) cut intercepts a1, a2 on x-axis, then
The equation of rectangular hyperbola with asymptotes as coordinate axes:
When the centre of any rectangular hyperbola be at the origin and its asymptotes concide with the coordinates axes, its equation is xy = c2.
Illustration: If the normal at point 't1' to the rectangular hyperbola xy = c2 meets it again at point 't2', prove that t13 = -1
Solution: ince the equation of normal at to the hyperbola xy = c2 is but this passes through then
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