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In a triangle ABC, bc co s^2 A/2 + ca c...

In a triangle ABC, `bc co s^2 A/2 + ca co s^2 B/2 + ab co s ^2C/2 = `

A

`(s-a)^(2)`

B

`(s-b)^(2)`

C

`(s-c)^(2)`

D

`s ^(2)`

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