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If [ sqrt (a ^(2) + b^(2) + ab)] + [ sqr...

If `[ sqrt (a ^(2) + b^(2) + ab)] + [ sqrt (a^(2) + b^(2) - ab)] = 1 ` then what is the value of ` (1 - a^(2)) (1 - b^(2)) ` ?

A

`1//4`

B

`4//7`

C

`5//4`

D

`3//4`

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The correct Answer is:
D
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