Respuesta :

Answer:

Step-by-step explanation:

[tex](tan\frac{\theta}{2} )(-sin\theta)\\=(\frac{sin~\frac{\theta}{2} }{cos\frac{\theta}{2} } )(-2sin\frac{\theta}{2} cos\frac{\theta}{2})\\=-2sin ^2 \frac{\theta}{2} \\=cos ~2 \theta-1[/tex]

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