(2)の解答の2tanθ/1-tan²θ＝2はなぜそうなるのか教えて欲しいです!!

基礎 「基礎問」とは、 できない)問題を 本書ではこの「基 効率よくまとめて ■入試に出題され 取り上げ 行います。 特 実にクリアでき 「基礎問」→「 題」で一つのう 一つのテーマは し 見やす した。 94 第4章 三角関数 基礎問 58 直線の傾きと tangent (1) 軸の正方向と75° をなす直線の傾きを求めよ. 味 ゆえに, m=1-m² m²+m-1=0 m0 だから (2) 2直線y=0 (z軸) と y=2xのなす角を2等分する直線の うち、第1象限を通るものを求めよ。 (1)直線の傾きと,直線がx軸の正方向となす角0の間には はこれだけでは答えがでてきません。 それは tan 75° の値を知 m=tan0 の関係があります. とても大切な関係式ですが、 ないからです.しかし, sin 75° や cos 75° ならば,75°=45°+30°と考えれ 54の加法定理が使えます. だから, ここではtangent の加法定理 ( ポイン を利用します。 (2) 求める直線を y=mx, m=tan 0 とおいて, 図をかくと, tan20=2を たすm (または tand) を求めればよいことがわかります. このとき,2倍 公式 (ポイント) が必要です. 解答 (1) 求める傾きは tan 75° tan 45° + tan 30° tan 75°= 1-tan 45° tan 30° tan45°=1だから tan (a+β) 45+30 1 + tan 30° 1+tan30° 1-tan 30° 1-1xtan30° にα=45°,β=30' 1 1+ 3 /3+1 を代入 = -=2+√3 1- √3-1 √3 tan +tanβ 1-tana tanẞ m= よって, y=- -1+√5 2 √5-1 2 -x (別解) A(1,0),B(1,m), C(1,2) とおくと, y=mx は∠AOC を2等分するので OA:OC=AB BC が成りたつ。 95 RE Ca <第1象限を通るから IA 53 : 1:√5=m: (2-m) .. (√5+1)=2 「角の2等分線の 性質」 √5-1 よって, m= 2 √5 +1 2 ポイント <加法定理> tan (α)=- < 2倍角の公式> ・tan20= tan atan B 1tan a tanẞ (複号同順) 2 tane 1-tan20 <半角の公式> 01-cos 0 tan2 2 1+cos 注 75°=120°-45°と考えることもできます. (2)求める直線を y=m, この直線がx軸の正方 yo 向となす角を0とすると (0<e</, m>0) /y=2x y=mx 第4章 注 これらの公式はすべて, tan0=- 2倍角の公式から導かれます. sin COS の関係と, sin, cos の加法定理, tan20=2 : 2 tan CB 演習問題 58 1-tan20 -=2 A 直線 y=x と y=2. のなす角を2等分する直線y=mx (m>0) を求めよ.

中3です。 何でこの答えになるのですか?

い。なお、空欄」 は、英文のあとに 〔注〕があります。(13点) D □には省略した形や数字は使わないものとします。 * *印のついている語句に Jon l (日本語のメモ) 英語部の七夕祭り D答え 日時:6月29日(木) 午後4時~午後6時 場所: 3A 教室(2階 音楽室のとなり) "also learn たんざく ・短冊に英語で願いごとを書いてみましょう。 ALTの先生に書き方を聞くことができます。 ・七夕の歴史や伝説についての英語の単語や表現も学ぶことができます。illA up to 19wens 180d shorty Tanabata, the Star Festival, hosted by the English Club nutos Date and time: ( A ), June 29 4:00p.m. -6:00p.m. Place: Room 3 A, next to the ( B ) room on the second floor lliw 2 A miwa lliw sd20 Let's write our ( C ) on tanzaku, "strips of paper, in English. You can ask the ALT how to write them. E-moites (C) . You can D some English words and expressions aboutA the history and "legend of Tanabata. 18

〰️の引いてあるmakingがどうなっているのかわからないです💦 分詞なのでしょうか、？ 分詞だとしたら、前にあるan intelligentl designedがもうcurriculumを修飾している感じがして、なんだか違和感です😢 この問題の解答はこんな感じです↓ 無... 続きを読む

(B) There is no doubt that language teaching will be made easier to some extent by an intelligently designed curriculum) making use of textbooks that introduce new vocabulary and sentence structures at a reasonable rate and with adequate repetition. At the same time, it is quite possible that a carefully designed 5 curriculum, no matter how excellent, may actually slow down learning if the teacher (2) makes students follow it too closely. Language learners benefit from exploring a language on their own, but they will have little opportunity for this if their teachers make all learning decisions for them.

この分のits の意味がわかりません。どういう働きをしているのですか？？？

(3) The writer (as / the show/is/as/its/of /actors/well-known). as of the Sherw is well-known as its actors. crowds those lectures of intelligent) the hotel.

下に全文訳を載せているのですが、特に最後の文章の意味とどう訳したかが分かりません。直訳と解説をお願いしたいです。 どういうわけか、私は日曜日には熱心に庭いじりをする。死ぬまでこうやっ ていこうと思う。私は地上の青々と育つ草木すべてにいささか「感動」を覚える。 こんなふうに... 続きを読む

8 演習 8 (問題→本冊: p.159) noo goblesb For some reason or other, I am an eager Sunday gardener. I will die one. I am a bit "touched" by every green-growing thing on earth. This strangeness has not put me in any hospital.

このforの意味？というか用法？を教えていただきたいです。

3 所有格の関係代名詞で名詞を修飾する 実践問題 5 世代 史と文をandでつなぐときに 「」が必要 S V here.) increasing numbers of people who have had a nomadic childhood and are not really “from" anywhere. 頻繁に戦地する 子供時代 More often than in previous generations/families may move around the country, and there are 前の世代よりもしばしば But for a majority of English people, pride and interest in the area (wheret 大多数 I'm from they grew up is still a 出身だ S reality. The country is full of football supporters whose main concern is for the club of their childhood, 実在 主な関心事 色 even though they may now live hundreds of miles away) たとえ~だとしても =even if (滋賀大 79 words)

英語の意味論のagentive formal constitution telic について教えてください

5行目から6行目にかけての黄色マーカー部分のleftがどのような文構造で働いているのか分からないので教えて頂きたいです。

5 の前 4. The link between brain size and intelligence is naively simplistic. It is not the size that matters but how you use it. There are some people a who are born with little brain tissue or others with only half ǎ brain as a result of disease and surgery, but they can still think and perform within the normal range of intelligence, because what brain tissue they do have left they use so efficiently. 効率 1601- cient 能な をひきおこす。 ch む doの後なので 現実は父

英文の方写真汚くて申し訳ないです汗　 ３パラグラフ目の印のしてあるaround が、和訳中のどの部分に当たるか分かりません。教えていただきたいです。

テーマ 専門性☆☆☆ 英文レベル★★★ 30 DNAはウイルスから? 文 11 What with the threat of bird flu, the reality of HIV, and the genera unseemliness of having one's cells pressed into labour on behalf of something alien and microscopic, it is small wonder that people don't much like viruses. But we may actually have something to thank the little 5 parasites for. They may have been the first creatures to find a use for DNA, a discovery that set life on the road to its current rich complexity 12 The origin of the double helix is a more complicated issue than it might at first seem. DNA's ubiquity -all cells use it to store their genomes - suggests it has been around since the earliest days of life 10 but when exactly did the double spiral of bases first appear? Some think it was after cells and proteins had been around for a while. Others say DNA showed up before cell membranes had even been invented/ The fact that different sorts of cell make and copy the molecule in very different ways has led others to suggest that the charms of the double 15 helix might have been discovered more than once. And all these ideas have drawbacks. "To my knowledge, up to now there has been no ⚫ convincing story of how DNA originated," says evolutionary biologist Patrick Forterre of the University of Paris-Sud, Orsay. 13 Forterre claims to have a solution. Viruses, he thinks, invented » DNA as a way the defences of the cells they infected. Little more than packets of genetic material, viruses are notoriously adept at* avoiding detection, as influenza's annual self-reinvention attests. Forterre argues that viruses were up to similar tricks when life was young, and that DNA was one of their innovations. To some researchers 25 the idea is an appealing way to fill in a chunk of the DNA puzzle. 270 •

第2パラグラフめの、和訳で言う、医薬品認可機関のところらへんについて質問です 。ここの英文を見ると as drug approval~ のas って何用法なんでしょうか？

テーマ 専門性★★★ *. 24 ヘルシンキ宣言 英文 ①②つなぎ方 demands that the physician use every means possible to cure the 1 The ultimate ethical standard among the medical profession - but does this apply in a clinical trial, which is patient's illness understood to be experimental, not treatment? In a clinical trial, tension exists at the beginning between gaining knowledge that can be used in the longer term to benefit the public health, and the basic right of the patient to receive treatment. 112 For the scientific profession, the ultimate standard is to produce results that withstand scrutiny. For physicians and researchers, the 'gold 10 standard' in testing new drugs is a placebo-controlled study* in which some of the patients receive no treatment at all. These standards present an ethical dilemma as drug-approval agencies tend to lean toward the need for clear scientific data, which is best gained when a drug is tested against a control, or placebo. Furthermore, it becomes harder to 15 convince patients in First World countries to participate in drug trials when there may be a 30-50% chance of receiving only a sugar pill instead of a helpful medicine. 13 As