Lost in Trigonometry

Geometry Level pending

\(If\quad tan\left( \frac { \pi }{ 4 } +\frac { y }{ 2 } \right) ={ tan }^{ 3 }\left( \frac { \pi }{ 4 } +\frac { x }{ 2 } \right) \quad then\quad sin\quad x\left( \frac { 3+{ sin }^{ 2 }x }{ 1+{ 3sin }^{ 2 }x } \right) =?\)

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