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JEE Advanced 2014 Paper 2

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Let a, r, s, t be non-zero real numbers.Let P(at2,2at),Q,R(ar2,2ar) and S(as2,2as)

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Question : 54

Total: 60

If st=1,then the tangent at P and he normal at S to the parabola meet at a point whose ordinate is

[JEE Adv 2014 P2]

(t2+1)2
2t3
a(t2+1)2
2t3
a(t2+1)2
t3
a(t2+2)3
t3

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