The value of (a +b) ^(2) - (a-b) ^(2) ...

The value of `(a +b) ^(2) - (a-b) ^(2) ` is

A

`4 ab`

B

`-4 ab`

C

`2a ^(2) + 2b ^(2)`

D

`2a ^(2) - 2b ^(2)`

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