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In a A B C ,2a csin((A-B+C))/2= (A) a^...

In a ` A B C ,2a csin((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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B
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