1. 5cos2x + 12cos x + 7 = 0 2. 10cos2x + 17sin x – 16 = 0
3. 2sin2x + 9sin x cos x + 4cos2x = 0
4. 4 tg x – 6ctg x + 5 = 0
5. 8sin2x + 3sin 2x = 14cos2x
6. 2sin2x – 7cos 2x = 6sin 2x + 7
3. 2sin2x + 9sin x cos x + 4cos2x = 0
4. 4 tg x – 6ctg x + 5 = 0
5. 8sin2x + 3sin 2x = 14cos2x
6. 2sin2x – 7cos 2x = 6sin 2x + 7