この手書きだと答えが違うのですが、なぜダメですか？

補充 例題 140 223 三角方程式の解法 (和積の公式の利用) ①①①①① 2πにおいて, 方程式 sin30- sin20+sin0 = 0 を満たす 0を求めよ。 CHART & SOLUTION [類 慶応大] 補充 139 2倍角, 3 倍角の公式を利用して解くのは大変 (別解 参照)。 3項のうち2項を組み合わせ て,和→積の公式 sin A+sin B=2sin- A+B A-B COS により積の形に変形。 2 2 残りの項との共通因数が見つかれば, 方程式は = 0 の形となる。 そのためには sin30 と sin0 を組み合わせるとよい。 解答 の 1 ヨチ 学 関 0与式から (sin30+sin0)-sin20=0 ここで sin30+sin0=2sin 30+0 30-0 COS 2 2 =2sin 20 cose よって 2sin 20cos-sin20=0 3 すなわち sin 20(2cos0-1)=0 あせ ← (30+0)÷2=20 である から sin 30, sin0 を組 み合わせる。 4章 積=0 の形に。 したがって sin200 または cos0= 0≦0 <2πであるから 0≤20<4л この範囲で sin200 を解くと 20=0, π, 2, 3π coso= の参考図 2 y1 1 π 3 よって 0=0,, x, x π, π 002 の範囲で cos0= π 5 |-1| を解くと 0= π 3 3 したがって,解は 3'2 0=0, 1, 7, 7. x. 3* 3 5 π, π 別解 sin 30 - sin 20+sin0 =3sin0-4sin0-2sinOcos0+sin0 =4sin 0-4 sin³0-2 sin cos 0 =2sin0(2-2sin'-cos0 ) =2sin(2cos2d-cose)=2sin0cos0 (2cos0-1) よって, 方程式は 2sincos (2cos0-1)=0 ゆえに sin00 または cos0=0 または cosθ=- 2 したがって、002 から求める解は π 0=0, 1, 1, x, x, 3 5 3' 2 π, 2T, 3π PRACTICE 140 53 T 13 ON |1 1x T 2 17 加法定理 sin30=3sin0-4sin 0, sin20=2sin Acoso ← sin20=1-cos2 COSA=Q を満たす 0 を求めよ。

一番最後の段落のinはなんの役割ですか？ その後のwhat が関係代名詞でその前のwhich の関係副詞節なのは分かっていても役が作れません。

6 Perkin and his fellow chemists received great riches (from these chemical VI 01 color discoveries), but couldn't overcome the British scientific leaders' dislike V2 4 O2) <for the commercial>. (By the time Perkin died (in 1907)), the British dye S industry had been overtaken (by Germany]), <which attracted the world's best chemists (to its factories) (in what Garfield calls "one of the first classic examples <of brain drain>.")> 0" S"

7番の問題についてです！ canにもmayにも「しても良い」という意味は含まれているのに、答えがmayになっている理由はなんですか？ ニュアンスの違いがあるのだと思うのですが、分からないので教えていただきたいです！

(5) サリーがあんな飲んだくれを好きだとは不思議だ。 It is strange that Sally ( would should 11 like ) such a drunkard. りました。 ありうる可能性がある=can It is that should. であるとは a/to/bin/tera) (6) 彼が嘘つきだなんてありうるだろうか。 彼はあんなに正直な男に見える。 ( Can )( he )( be ) a liar? He looks like su もし急いでいるのなら私の自転車を使ってもいいですよ。 ~して (例)^ You ( fan mo may )( use ) my bicycle if you are in a hurry. (8) 私は一生懸命勉強しなければならない。 この前の試験の成績が悪かったから。 "( have )( to )( " Study ) hard. I had a bad gra (9) その犬はお腹をすかせているに違いない。 何も食べていないのだから。 The dog ( must )( be ) ( hungry ). It hasn't ea

英検準一級　ライティングです。 添削していただきたいです。

2021-3 動物から作られた製品を使うのを止めるべきか?(いえ) 点物とない地域でなく着られる. ○Product quality 動物の皮でつくられた衣類はあたたかく、すである (一人のものよりも)→長い間着ることが出来るLag,wallet. →リュースする取組 cloth componyが行っている動物のことを ○Tradition 伝統的な衣類として昔からよく着られてる また、それは民族を動物の友好frendshipを表しているものもある。 御下でる In my opinion, people don't have to stop usting goods that are made from animals for two reasons, such as Product quality and Tradition. (24) Firstly, the goods, for example clothes, bag, and wallet,are stronger than artificial goods. So, we can use them for long times. Some people say that using such goods are bad for animals, but there is a cloth company which do the reuseing project for clothes with using animals in Japan, and it is remarkable Secondly, in particular cold countries, goods that made from animal. are often used sias traditional clothes or goods stuce before. And, some tell friendship with people to animals which live with for many years, B4) For these reasons, I think that people needs't stop using them. ((25) いろ (55)

写真のbuying •••will create more satisfaction than does buying •••の部分で、後半に倒置が起きてるのはわかったのですがこれって元の文はthan buying stuff for others doesですよね。なぜw... 続きを読む

he concludes that it would be better, in most cases, to give cash: "Economic - theory and common sense - lead us to expect that buying stuff for SV ourselves will create more satisfaction than does buying stuff for others (les) 20 Buying gifts typically destroys value and can only (in the unlikely best がいして special case, be as good as giving cash."

(a) をどう直せばいいのでしょうか？？わかる方お願いします。

Along with a great loss of life, many historic buildings were destroyed with (A) (B) the earthquake. NO ERROR (E) (C) (D

かっこに入るのは (d) で始まる単語らしいのですが、わかる方お願いします。

The strict rules against littering in the park, which include expensive fines, are intended to be a ( ) to visitors who might otherwise leave their trash behind.

英語の文法の参考書についてです。 参考書に「S+V+O+do の形をとる動詞」の例として「see A do〜」の例が載っていました。私は参考書のdoとは動詞の原型というふうに思っていましたが、例えば「I see him standing over there.」という文の場... 続きを読む

問4の（2）についてです 私は（2）に「先生を思い出す」と言う意味でウを選んだのですが、答えはアでした。なぜウだと不適なのか教えていただきたいです🙇🏻‍♀️😭

(配点 23) Everyone wants to do well on tests. Here is some advice from successful students on how to do well on tests. Listen to the teacher from the first day of class for hints about what is important. For example, the teacher will emphasize the important information by repeating it or telling you it is important. When you look over your textbook and notes again, you should already know what is important. After each lecture, look over your notes again. Come to class ready to ask questions about what you don't understand. C Look at the visual aids the teacher uses. For example, if the teacher asks you to look at a diagram or graph in your textbook, make sure you understand why that diagram or graph is important. There may be a question on the test that asks about that diagram. Study for an essay exam. Students who prepare for essay exams do better on all types of exams. Students need to know more information for essay exams than for true/false or short-answer exams. There are no hints on the exam itself, so students must learn more for essay exams. To prepare for an essay exam, always read the *material twice before you start taking notes. When you read the material the first time, it may seem difficult. When you read the material the second time, it will seem easier. This is similar to when you (1) have to find the way to a friend's house for the first time. The second time you go to your friend's house, it's easier because you know the way. It may even seem shorter because you don't have to slow down as much to check street names or landmarks. The same is true with the material you read. The second time you will already know the words and ideas. In China, they lp to stop de After you've read the material twice, take notes. At this point, you'll find that you know some of the material and can focus on what is most important. Don't ignore *footnotes in your reading. Sometimes teachers think the information in a footnote is important and will ask a question about it. Write down the important information in is in the years t your notes. After you take notes, go back and add your opinions to them. Write down For food in the desert. the ideas that you agree with and the ideas that you disagree with. People remember ants ex large number

The person who influenced me the most in my life について英作文します‼️ 例を教えてください‼️