user-avatar
hoangnhi14021998
2 năm trước
CHo em hỏi là để tìm nghiệm $sinx + cosx = 0$ thì tại sao mình k chuyển cos x sang là $sinx = -cos x = -sin (pi/2 - x)$ vậy ạ. Làm thế vì sao lại sai?
Thích Trả lời Chia sẻ

Các câu hỏi liên quan

6h2 23/5/2021 Ex1: COMBINE INTO ONE SENTENCE WITH TOO ,SO 1. They can play table tennis. We can play table tennis. They can play table tennis and we can, too (or so can we) 2. He sings love songs very well. His sister sings love songs very well. _______________________________________________________ 3. I write diary every night. My mother writes diary every night. _______________________________________________________ 4. She is swimming in the pool. Her children are swimming in the pool _______________________________________________________ 5. Hoa’ll eat bread with milk for breakfast. Hoa’s uncle will eat bread with milk for breakfast _______________________________________________________ 6. Milk is good for your health. Fruit juice is good for your health. ______________________________________________________ 7. Betty does morning exercise. Betty’s aunt does morning exercise. _______________________________________________________ 8. Lan can ski. My grandpa can ski. Ex2: Put “so” and “too” in the blanks. 1)Ali speaks French well and (my brother)......................... 2)Chris can ski( I ).................. 3)They have got a color TV, (Mary )................. 4)We live in a small flat,(they).................... 6)Tom plays chess well, (Minh)........... 9)She wears a green coat, (Bill).................. 12)Mary types well,(Lan) ............... 14)They will leave at noon,( I )............ 15)He has an early appointment,(I)............. 16)I must write them a letter,(she).............

2018 © Loga - Không Ngừng Sáng Tạo - Bùng Cháy Đam Mê
Loga Team