СРОЧНО. До 14 часов 01.11.2021
Доказать , что .[tex]\displaystyle \frac{sin^{2}\beta }{sinx^{2} \alpha -sin ^{2} \beta } =\frac{sin^{2}\alpha }{sin^{2}\beta -sin^{2} \alpha }[/tex] Ну или , что не равны
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