Решите уравнения по математике:
1) √2cos^2 2x - cos2x=0;
2) 6 cos^2x + 5sinx - 7=0;
3) sin^2x + 2√2sinx cosx +1 =0;
4) sin^2 2x + cos^2 3x=1;
5) √3 cosx + sinx=2;

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