HOC24
Lớp học
Môn học
Chủ đề / Chương
Bài học
Chứng minh: 1+cot²x/1- cot²x = -1/ cos2x
Chứng minh : 3cos⁴x + sin⁴x = 1 + cos2x + cos²2x
Rewrite each sentence so that it contains the word given in capitals, and so that the meaning:
1.Listen! That may be Lisa-she said she'd call at 4.30. (MIGHT)
->Listen! That.....Lisa- she said she'd call at 4.
2. We studied nearly 20 hours for the chemistry test - the teacher was absent again. (NEEDN'T)
->We....studied nearly 20 hours for the math test because the teacher was absent again
3.I think you should give up smoking immediately. (HAD)
->...
Rút gọn biểu thức: B = (sin^2 (4x) - sin^2 (2x))/(cos^2 x - cos^2 (2x))
Từ các chữ số 0,1,2,3,4,5,6,7,8 có thể lập được bao nhiêu số tự nhiên chẵn có 4 chữ số khác nhau đôi một và lớn hơn 4568? Cần gấp ạ.
Từ 0,1,2,3,4 hỏi có bao nhiêu số có 4 chữ số khác nhau lớn hơn 3200 Cần gấp ạ
Complete the second sentence so that it has a similar meaning to the first one. 1. "I've visited this cave three times, Bailey" said William. ->William told Bailey that... 2. "Have you had enough bottled water for the tour?" the tourist asked the guide. ->The tourist asked the guide... 3. They ought to have online marketing if they are to increase sales. ->If they don't...