ДАЮ 40 БАЛІВ
допоможіть будь-ласка
[tex]( \frac{ \sin4 \alpha }{ \sin \alpha } - \frac{ \cos4\alpha }{ \cos \alpha } ) \times ( \frac{1}{ \sin3 \alpha } + \frac{1}{ \sin \alpha } )[/tex]
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