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The sum of the reciprocals of focal dist...

The sum of the reciprocals of focal distances of a focal chord `PO` of `y^2=4ax` is

A

`1/a`

B

a

C

2a

D

`1/2a`

Text Solution

Verified by Experts

The correct Answer is:
A
Required sum `=(1)/(2a)+(1)/(2a)=(2)/(2a)=1/2`
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