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| 1. |
\begin{array}{l}{\text { If } 1,\omega, \omega^{2} \text { are the cube roots of unity, }} \\ {\text { then } P . T . \frac{1}{1+2 \omega}+\frac{1}{2+\omega}=\frac{1}{1+\omega}}\end{array} |
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