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a, b, c are the lengths of three sides of a `DeltaABC`. If a, b, c are related by the relation `a^(2)+b^(2)+c^(2)=ab+bc+ca`, then the value of `(sin^(2)A+sin^(2)B+sin^(2)C)` is

A

`(3 sqrt3)/2`

B

`9/4`

C

`3//4`

D

`3//2`

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