1.

P(theta ) and Q( phi )are two point onx^(2)//a^(2) -y^(2)//b^(2) =1such thattheta - phi = 2alpha .PQtouches the conic

Answer»

` (x^(2) cos ^(2) ALPHA )/( a^(2)) -(y^(2))/( B^(2)) =1`
` (x^(2))/( a^(2)) -(x^(2)cos ^(2) a)/( b^(2)) =1`
` (x^(2))/(a^(2)) =(y^(2))/(b^(2)) = cos ^(2) alpha `
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ANSWER :A


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