Q.

The portion of the tangent intercepted between the point of contact and the directrix of the parabola subtends at focus is angle k (in radians) then 4kπ equal to 

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answer is 2.

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Detailed Solution

 

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The angle subtended by the portion of tangent between  point ofcontact and directrix at focus is 90°   k=π2 Now 4kπ=4(π2)π=2 

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