Q.

The point of contact of the tangent to the parabola

y2=9x which passes through the point (4, 10) and
makes an angle θ with the axis of the parabola such
that tanθ>2 is 

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a

(1/4, 3/2)

b

(4, 6)

c

(4/9, 2)

d

(36, 18)

answer is A.

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Detailed Solution

Equation of the tangent at any point 9t2/4,9t/2

on the parabola is ty=x+9t2/4. Since it passes
through (4, 10), 10t=4+9t2/4 or 9t240t+16

=0.

t=4/9,4tanθ=1/t>2t<1/2. So

t=4/9 and the required point is (4/9, 2).

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