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In a triangle ABC, 2casin.(A-B+C)/(2)=...

In a triangle ABC, `2casin.(A-B+C)/(2)=`

A

`a^(2)+b^(2)-c^(2)`

B

`c^(2)+a^(2)-b^(2)`

C

`b^(2)-c^(2)-a^(2)`

D

`c^(2)-a^(2)-b^(2)`

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