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Two mutually perpendicular tangents of the parabola `y^(2)=4ax` meet the axis at `P_(1)andP_(2)`. If S is the focal of the parabola, Then `(1)/(SP_(1))+(1)/(SP_(2))` is equal to

A

`1/(4a)`

B

`1/a`

C

`2/a`

D

`4/a`

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The correct Answer is:
B
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