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[" Thetangent at a point "P" on the hyperbola "(x^(2))/(a^(2))-(y^(2))/(b^(2))=1" meets one of the directrix in "F" .If PF subtends an "],[" angle "theta" at the corresponding focus,then "theta" equals "],[[" (A) "pi/4," (B) "pi/2," (C) "3 pi/4," (D) "pi]]

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