Question

1. 3sin2 x – 7sin x + 4 = 0
2. 6sin2 x – 11cos x – 10 = 0
3. sin2 x + 5sin x cos x + 6cos2 x = 0
4. 4 tg x – 12ctg x + 13 = 0
5. 5 – 8cos2 x = sin 2x
6. 7sin 2x + 9cos 2x = –7