1.12sin^2 x – 20sin x + 7 = 0 2. 3sin^2 x + 5cos x + 5 = 0

3. 3sin^2 x + 13sin x cos x + 14cos^2 x = 0

4. 3 tg x – 4ctg x + 11 = 0

5. 8cos^2 x + 7sin 2x + 6sin^2 x = 0

6. 1 – cos 2x = 18cos^2 x – 8sin 2x Помогите пожалуйста очень надо
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