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| 1. |
\left. \begin{array} { l l } { \ell \operatorname { cos } ( \theta / 2 ) } & { ( 2 ) 2 \ell \operatorname { sin } ( \theta / 2 ) } \\ { 2 \ell \operatorname { cos } ( \theta / 2 ) } & { ( 4 ) \ell \operatorname { sin } ( \theta / 2 ) } \end{array} \right. |
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