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(x_{1}, y_{1}) (x_{2}, y_{2})

\frac{1}{2} (x_{1} y_{2} - x_{2} y_{1})

\frac{1}{2} (x_{1} y_{1} - x_{2} y_{2})

\frac{1}{2} (x_{1} y_{1} - x_{2} y_{2})

\frac{1}{2} (x_{1} y_{2} - x_{2} y_{1})

ANS : 1

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