Решите пожалуйста, очень прошу
1)[tex]log^2_5x+0.5log_5x^2=2[/tex]
2)[tex]cos^2*22.5^0-sin^2*22.5^0+1[/tex]
3)Найти[tex]tg \alpha[/tex], если [tex] cos \alpha =-0.8; \frac{ \pi }{2}\ \textless \ \alpha \ \textless \ \pi [/tex]

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