Step-by-step explanation:
[tex] - \csc { }^{2} (9) + \cot {}^{2} (9) [/tex]
[tex] - \frac{1}{ \sin {}^{2} (9) } + \frac{ \cos {}^{2} (9) }{ \sin {}^{2} (9) } [/tex]
[tex] - ( \frac{1}{ \sin {}^{2} (9) } - \frac{ \cos {}^{2} (9) }{ \sin {}^{2} (9) } )[/tex]
[tex] - ( \frac{ \sin {}^{2} (9) }{ \sin {}^{2} (9) } )[/tex]
[tex] - (1)[/tex]
[tex] - 1[/tex]
The answer is -1
