Помогите, очень срочно!!!
1)2arctg1 + 3arcctg(-1/√3) =
2)2sinx =√2
cosx =√3/2
cosx =4/5
ctgx =1/√3
3)3tg(2x + π/6) + √3= 0
2sin(3x - π/4) = -√2
4)6cos²x - 13sinx - 12 = 0
2sin²x - sinx - 1=0
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