Chứng minh biểu thức ko phụ thuộc vào biến x Cos^4x-sin^4x +2cos^2x

Ai lm được đâu thì lm Em đang cần gấp a

Ai giúp mình với đặt nhân tử chung và hằng đẳng thức bình phương

Mn ơi giúp e vs ah e đg cần Gasp plssss😭😭😭😭😭😭 E cảm ơn trc ạ

Dựa vào bài "Cổng trường mở ra", viết đoạn văn từ 8 - 10 câu cảm nhận về tâm trạng khác nhau của người mẹ và con trước ngày khai giảng đầu tiên vào lớp Một của cậu bé. Ai giúp mình với nha!!!!!!!

Of course, London is famous for that it's attractions like Big Ben and the Tower of London. Millions of tourist look at these buildings every year - but not far distance from these places, there are other interesting sights. Next time you set off to visit London, why not plan to go some of the places close in to the centre of the city that tourist rarely go to? Get into of a taxi and ask the driver to take you to Billingsgate fish market, you'll be amazed at the sights and sounds of real London. You can ask to the fish sellers about their work - and you don't have to wait on for hours to get a ticket! Mn tìm lỗi sai và sửa lại trên đoạn trên giúp m nha!

1 . Hãy nêu cách tìm số các số hạng của dãy số cách đều và tổng dãy số cách đều

I.Write one word in each gap. 1. Bill Gates made his money by satisfying the ................................ for computer operating systems that were easy to use. 2. I was ................................ the Web when I came across a site that had lots of information about my favorite band. 3. Click on the ................................ below to become a member and enjoy everything that Musiconline has to offer. 4. When you’re................................ the wheel of the new T4 sports car, it’s obvious that there’s a lot of computing power under the bonnet, as well as engine power. 5. Now, don’t complain about having to spend the holidays away from your computer - it’s for your own................................ and you’ll thank me later. 6. Since she changed jobs, Anne has really thrown her ................................ into her career. 7. You should keep your computer system up to ................................., or you might find that some programs won’t run. 8. The workman said that he needed a spanner and asked me to pass him one from his ................................ kit. II. There have been 44 American presidents; however, only 11 of the 44 presidents served two full consecutive terms. Other presidents have been elected to serve a second term, but were unable to finish the additional term for various reasons. For example, Lincoln was assassinated and Nixon resigned. ?? The author’s main purpose is to A. justify Nixon’s resignation B. discuss two-term presidents C. make fun of American presidency D. illustrate the dangers of presidency

Viết về quê hương bằng tiếng anh Gợi ý Quê hương mình ở đâu? con người ? Ý nghĩa

Giúp mình với.Mình không biết cách làm