Math Chapter Wise Conic Section English MCQ PGT 2011 Q.The line xcosα+ysinα=p is tangent to the ellipse 2 2 x y 1 a b + = + = is: Aa2 cos2 α–b2 sin2 α= p2 Ba2 sin2 α+b2 cos2 α= p2 Ca2 cos2 α+b2 sin2 α= p2 Da2 cos2 α–b2 sin2 α= p Show answer Correct answer: a2 cos2 α+b2 sin2 α= p2