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| 1. |
\left. \begin{array} { l } { \text { The polynomial, } x ^ { 2 } + y ^ { 2 } - z ^ { 2 } - 2 x y \text { on factorization gives } } \\ { ( A ) ( x - y - z ) ( x - y + z ) } \\ { ( C ) ( x + y + z ) ( x - y - z ) } \end{array} \right. |
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