\left. \begin{array} { l } { ( \frac { a } { a - 2 } - \frac { a + 1 } { 1 - a } - \frac { 3 + 2 a ^ { 2 } } { a ^ { 2 } - 3 a + 2 } ) \cdot \frac { a ^ { 2 } - 4 } { 2 a + 5 } } \\ { [ ( a x + a - 2 x - 2 ) ^ { - 1 } \cdot a ^ { 2 } + 4 a - 12 ] ^ { - 2 } \cdot 0 } \end{array} \right.
Evaluate
\frac{a+2}{1-a},\ 0
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