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If the function y=f(x) is defined by 2^(...

If the function `y=f(x)` is defined by `2^(x)+2^(y)=2` then the domain of `f(x)` is

A

`(0, 1]`

B

`[0, 1]`

C

`(-oo, 1)`

D

`(-oo, 0]`

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