Q.
A. (xy1 - yx1) = 2(x2 + y2 )
B. (xy1 - yx1) = d2 (x2 + y2 )
C. (xy1 - yx1) = (x2 + y2 )
D. (xy1 - yx1) = d2 (x2 - y2 )
E. None of the above
Correct choice: B
Explanation: