Xét phương trình: 3cos^2x -2cosx-4=0 trên đoạn [ 0 , 3 π ]. Phương trình có bao nhiêu ngiệm? Giúp mk với ạ

Các câu hỏi liên quan

3 Ask about the underlined words, then match the questions to the pictures. 1. ………………………………………………………………………………………… . The kids are climbing up the tree in the garden. 2. ………………………………………………………………………………………… . He plays baseball twice a week. 3. ………………………………………………………………………………………… . They drove to the beach on Sunday. 4. ………………………………………………………………………………………… . Linda saw a squirrel when she got up. 5. ………………………………………………………………………………………… . He loves rainy days. 6. ………………………………………………………………………………………… . Paul is chasing his brother in the park. 7. ………………………………………………………………………………………… . The want to go to the zoo. 8. ………………………………………………………………………………………… . The two boys are hiding behind the door. 9. ………………………………………………………………………………………… . Mum cut his son’s hair yesterday morning. 10. ………………………………………………………………………………………… . Lisa went to the supermarket with her mother. 11. ………………………………………………………………………………………… . Frank has bought Mary a bunch of flowers. 12. ………………………………………………………………………………………… . Tom is helping his dad take the rubbish out. 13. ………………………………………………………………………………………… . She is crying because she has got lost. 14. ………………………………………………………………………………………… . Dave goes to school on foot.