[tex] \sin( \alpha ) \cos( \alpha ) ( \tan( \alpha ) - \cot( - \alpha ) )[/tex]
[tex] \sin( \alpha ) \cos( \alpha ) ( \tan( \alpha ) + \cot( \alpha ) )[/tex]
[tex] \sin( \alpha ) \cos( \alpha ) ( \frac{ \sin( \alpha ) }{ \cos( \alpha ) } + \frac{ \cos( \alpha ) }{ \sin( \alpha ) } )[/tex]
[tex] { \sin }^{2} \alpha + { \cos }^{2} \alpha = 1[/tex]
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[tex] \sin( \alpha ) \cos( \alpha ) ( \tan( \alpha ) - \cot( - \alpha ) )[/tex]
[tex] \sin( \alpha ) \cos( \alpha ) ( \tan( \alpha ) + \cot( \alpha ) )[/tex]
[tex] \sin( \alpha ) \cos( \alpha ) ( \frac{ \sin( \alpha ) }{ \cos( \alpha ) } + \frac{ \cos( \alpha ) }{ \sin( \alpha ) } )[/tex]
[tex] { \sin }^{2} \alpha + { \cos }^{2} \alpha = 1[/tex]