[tex]\displaystyle\bf\\\frac{Sin^{2} \alpha -1}{1-Cos^{2} \alpha } =\frac{-(1-Sin^{2}\alpha ) }{Sin^{2} \alpha } =-\frac{Cos^{2} \alpha }{Sin^{2}\alpha } =-Ctg^{2} \alpha \\\\\\\alpha =\frac{\pi }{4} \\\\\\-Ctg^{2} \frac{\pi }{4} =-1^{2} =-1\\\\\\Otvet \ : \ -1[/tex]
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[tex]\displaystyle\bf\\\frac{Sin^{2} \alpha -1}{1-Cos^{2} \alpha } =\frac{-(1-Sin^{2}\alpha ) }{Sin^{2} \alpha } =-\frac{Cos^{2} \alpha }{Sin^{2}\alpha } =-Ctg^{2} \alpha \\\\\\\alpha =\frac{\pi }{4} \\\\\\-Ctg^{2} \frac{\pi }{4} =-1^{2} =-1\\\\\\Otvet \ : \ -1[/tex]
Надеюсь на лучший ответ.