Помогите пожалуйста
1) sin2x+cos^2x=0
2) cosx+sin^2x+1=0
3) log_2(x-2)+log_2x=log_2 3
4) lg(x+2)+lgx=lg3
5) 4^x+1-2^2x-2=30
6) 9^x-1-3^2x-4=72
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