Докажите тождество:

[tex]( \frac{ \sin(4 \alpha ) }{ \sin( \alpha ) } - \frac{ \cos(4 \alpha ) }{ \cos( \alpha ) } )( \frac{1}{ \sin(3 \alpha ) } + \frac{1}{ \sin( \alpha ) } ) = 4 \cot( \alpha ) [/tex]
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