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If the feet of the perpendiculars from (...

If the feet of the perpendiculars from (3, 4, 5) to the coordinate axes are A, B, C and the angle between AB and AC is `Cos^(-1)(9/a)` then a =

A

`5sqrt(34)`

B

`3sqrt(34)`

C

`sqrt(34)`

D

25

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The correct Answer is:
A
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