Step-by-step explanation:
[tex] \tan(x) \csc {}^{2} (x) - \tan(x) [/tex]
[tex] \tan(x) ( \csc {}^{2} (x) - 1)[/tex]
[tex] \tan(x) ( \cot {}^{2} (x) [/tex]
[tex] = \tan(x) \cot(x) \cot(x) [/tex]
[tex]1 \cot(x) [/tex]
[tex] = \cot(x) [/tex]
