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If a chord joining the points P (a sec t...

If a chord joining the points `P (a sec theta, a tan theta) & Q (a sec phi, a tan phi)` on the hyperbola `x^2 - y^2 = a^2` is a normal to it at P, then show that `tan phi = tan theta (4 sec^2 theta – 1)`.

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If a chord joining the points P(a sec theta,a tan theta)&Q(a sec theta,a tan theta) on the hyperbola x^(2)-y^(2)=a^(2) is a normal to it at P then show that tan phi=tan theta(4sec^(2)theta-1)

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