Let A(z(1)) and B(z(2)) be such that ang...

Let `A(z_(1))` and `B(z_(2))` be such that `angleAOB=theta('O')` being the origin). If we define `z_(1) xx z_(2) = |z_(1)||z_(2)|sintheta`, then `z_(1) xx z_(2)` is also equal to

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