यदि x = ( sqrt ( a + b ) - sqrt (a -b )...

यदि `x = ( sqrt ( a + b ) - sqrt (a -b ))/( sqrt (a +b ) + sqrt (a -b )),` तो `bx ^(2) – 2 ax + b` किसके बराबर है` (bne 0)` ?

A

0

B

1

C

ab

D

2 ab

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