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Let f(x)=x^(2)-2x-1AA x in R , Let f,(-o...

Let `f(x)=x^(2)-2x-1AA x in R , Let f,(-oo,a] to [b,oo)`, where 'a' is the largest real number for which f(x) is bijective.
The value of (a+b) is equal to

A

`-2`

B

`-1`

C

`0`

D

`1`

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