Решить тригонометрическое уравнения: 1) 2sin2x + 5cosx - 4 = 0;
2) 2tgx - ctgx - 1 = 0;

3) 3sin2x - cos2x = 0;
4) 3sin2x + 4cos2x – 13sinx ∙cosx = 0;

5) 3sin2x - 2sinx ∙cosx = 3cos2x;
6) 3cos2x = 4sinx ∙cosx - sin2x​
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