# #1_2015

**Algebra**Level 3

**\(tan\alpha +tan\beta +tan\gamma =tan\alpha .tan\beta .tan\gamma \)** and **\(x=cos\alpha +isin\alpha \quad ,\quad y=cos\beta +isin\beta \quad ,\quad z=cos\gamma +isin\gamma \)**, then **\(xyz\)** equals

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