Помогите, очень срочно !!!!!!!!!!! за все 3 решения дам 40 баллов⇅ 1) 4cos⁴x-4cos²x+1=0 [-2п ; - п ]
2) 2√3sin²(x+3п/2)+sin2x=0 [ -4 ; -5п/2]
3)cos2x-√2sin(п/2-x)+1=0 [ -4п; -5п/2]
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