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| 1. |
\begin{array}{c}{\text { 13. Factorise the following using suitable identity: }} \\ {\text { (i) } \quad a^{4}+a b^{3}} \\ {\text { (ii) } a^{4}+b^{4}+c^{4}+2 a^{2} b^{2}+2 b^{2} c^{2}+2 c^{2} a^{2}}\end{array} |
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