1. а) sin(x-1)=cos(x+2)
б) sin(3x+3)=cos(x-1)
2. а)8sin² x/2-3sin x-4=0 б)4sin² x/2-cos² x/2=1,5+sin x
3. tg(x-15°)ctg(x+15°)=⅓
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