\left. \begin{array} { c } { \frac { 1 } { 2 } x \{ x _ { 1 } ( y _ { 2 } - y _ { 3 } ) + x _ { 2 } ( y _ { 3 } - y _ { 1 } ) + x _ { 3 } ( y _ { 1 } - y _ { 2 } ) } \\ { \frac { 1 } { 2 } x _ { 2 } ( - 4 ) x ( ( - 5 ) - 3 ) + ( - 3 ) \times ( 3 - ( - 2 ) ) + 2 } \\ { ( ( - 2 ) - ( - 5 ) ) ^ { 2 } } \end{array} \right.
Evaluate
\frac{x\left(x_{1}\left(y_{2}-y_{3}\right)+x_{2}\left(y_{3}-y_{1}\right)+x_{3}\left(y_{1}-y_{2}\right)\right)}{2},\frac{x\left(16xx_{2}-13\right)}{2},\frac{9x}{2}
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