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In any A B C , the value of 2a csin((A...

In any ` A B C` , the value of `2a csin((A-B+C)/2)` is (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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