Tangens Triqonometriya - Wikipedia

${\displaystyle \tan(90-\alpha )=\tan \alpha }$ 

${\displaystyle \tan(90+\alpha )=-\cot \alpha }$ 

${\displaystyle \tan(180-\alpha )=-\tan \alpha }$ 

${\displaystyle \tan(180+\alpha )=\tan \alpha }$ 

${\displaystyle \tan(270-\alpha )=\cot \alpha }$ 

${\displaystyle \tan(270+\alpha )=-\cot \alpha }$ 

${\displaystyle \tan(360-\alpha )=-\tan \alpha }$ 

${\displaystyle \tan(360+\alpha )=\tan \alpha }$ 

${\displaystyle \tan 2\alpha ={\frac {2\tan \alpha }{1-\tan ^{2}\alpha }}}$ 

${\displaystyle \tan 3\alpha ={\frac {3\tan \alpha -\tan ^{3}\alpha }{1-3\tan ^{2}\alpha }}}$ 

${\displaystyle \tan(\alpha +\beta )={\frac {\tan \alpha +\tan \beta }{1-\tan \alpha *\tan \beta }}}$ 

${\displaystyle \tan(\alpha -\beta )={\frac {\tan \alpha -\tan \beta }{1+\tan \alpha *\tan \beta }}}$ 

${\displaystyle \tan \alpha +\tan \beta ={\frac {\sin(\alpha +\beta )}{\cos \alpha *\cos \beta }}}$ 

${\displaystyle \tan \alpha -\tan \beta ={\frac {\sin(\alpha -\beta )}{\cos \alpha *\cos \beta }}}$ 

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