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If the sum of the squares of the sides ...

If the sum of the squares of the sides of a triangles ABC is equal to twice the square of its circum diameter , then
` sin ^(2) A + sin ^(2) B + sin ^(2) C = `

A

` 4`

B

`3`

C

` 1`

D

`2`

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The correct Answer is:
D
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