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If tan ^(-1) ((a)/(x))+tan ^(-1) ((b)/(x...

If `tan ^(-1) ((a)/(x))+tan ^(-1) ((b)/(x))=(pi)/(2),` then `x=`

A

`sqrt(a b)`

B

`sqrt(2 a b)`

C

`2 a b`

D

`a b`

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The correct Answer is:
A
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