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| 1. |
Show that \left| \begin{array}{lll}{b+c} & {b c} & {b^{2} c^{2}} \\ {c+a} & {c a} & {c^{2} a^{2}} \\ {a+b} & {a b} & {a^{2} b^{2}}\end{array}\right|=0 |
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