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Length of focal of the parabola y^(2)=4a...

Length of focal of the parabola `y^(2)=4ax` making an angle `alpha` with the axis of the parabola is

A

`4a sec^(2) alpha`

B

`a cosec^(2) alpha`

C

`4a cosec^(2) alpha`

D

none of these

Text Solution

Verified by Experts

The correct Answer is:
C
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