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Q.

If two normals at t1 and t2 meet again the parabola y2=4ax at t3 then the value of t1t2 is

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a

-3

b

2

c

1

d

-2

answer is B.

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Detailed Solution

Since the normal at t1 meets the parabola at t3

so t3=t12t1.                              

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Similarly, t3=t22t2

Thus, t12t1=t22t2

 t1t2=2t22t1=2t1t2t1t2 t1t2=2

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