In triangle A B C ,2a csin(1/2(A-B+C)) i...

In triangle `A B C ,2a csin(1/2(A-B+C))` is equal to `a^2+b^2-c^2` (b) `c^2+a^2-b^2` `b^2-c^2-a^2` (d) `c^2-a^2-b^2`

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