Ответ:
[tex]\displaystyle -\frac{1}{sin^2\alpha}[/tex]
Пошаговое объяснение:
[tex]\displaystyle \frac{1}{cos^2\alpha-1}=-\frac{1}{1-cos^2\alpha}=-\frac{1}{sin^2\alpha}[/tex]
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Ответ:
[tex]\displaystyle -\frac{1}{sin^2\alpha}[/tex]
Пошаговое объяснение:
[tex]\displaystyle \frac{1}{cos^2\alpha-1}=-\frac{1}{1-cos^2\alpha}=-\frac{1}{sin^2\alpha}[/tex]