Решите
тригонометрические
уравнения:
1. 2sin 2 x – 5sin x – 7 = 0
2. 12sin 2 x + 20cos x – 19
= 0
3. 3sin 2 x + 14sin x cos x
+ 8cos 2 x = 0
4. 7 tg x – 10ctg x + 9 = 0
5 . 5sin 2 x – 14cos 2 x + 2
= 0
6 . 9cos 2 x – 4cos 2 x =
11sin 2 x + 9​