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[" The equation of the normal to the hyperbola "x=a sec theta" ,"],[y=b tan theta" at the point "(a sec theta,b tan theta)" is "-],[" (4) "ax cos theta+by cot theta=a^(2)+b^(2)],[" (B) "ax cos theta+by tan theta=a^(2)+b^(2)],[" () "ax sin theta-by cot theta=a^(2)-b^(2)],[" (D) "ax cos theta-by tan theta=a^(2)-b^(2)]

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