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