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If a^(2)+b^(2)+c^(2)=1, then the range o...

If `a^(2)+b^(2)+c^(2)=1`, then the range of `ab+bc+ca` is

A

`[-1//2, 1]`

B

`[-1//2, oo)`

C

`[1, oo)`

D

none

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