丸で囲ってるところ どうやって1を出したのかがわからないです。

1のn乗根と TC 例題61 COS の値 n 2 ²/²z+ 2 -π+isin π とする｡ 57 a = cos 5 (1) α°,1+α+α² + α°+α, 1 +α +α + α+ (α) の値を求めよ。 2 (2) cos 15 の値を求めよ。 (1) ド・モアブルの定理を用いる。 1+α+a²+a+α* 因数分解 1=(x-1)(x+x+x2+x+1)を利用。 前問の結果の利用 αと αα = |α|2 を利用 の関係 → 1+α+α²+a+ (α) をつくる。 Action》 α-1 +α - 2+ +α+1は,α-1の因数分解を利用せよ (②2) cos/2/3=(axの実部 COS この式で COS / πを表すと? α, Action》αの実部は, 1/12 (α+α)を考えよ 5 (1)=(cos = (cos-²/+isin / )* = cos2π+isin2=1 5-1=0 これより よって (α-1)(a^ + α + α² +α+1)=0 _ αキ1 であるから 1+α+α°+α°+ α = 0 1 |a| = 1 すなわちad = 1 より, a であるから a 1 1 1+a+a² + a + (a)² = 1 +a+a² + + amica² 18(1 1+a+a² + a³ + aª = 0 a² 2 2 (2) x = cos- -π とおくと, COS 1/1/(a+α)である 5 から α+α = 2x また a²+(a)²=(a+α)²-2aa =4x²-2 (1) より, 1+ (a+α)+{a²+(a)^}=0であるから, ①, ② を代入すると 4x2+2x-1=0 2 −1+√5 4 x = COS π>0 であるから cos= 5 2 α = COS 02/77 + in / π+isin πとする。 (1) ° + α5 + α* + + α + α+1の値を求めよ。 (2) 3+ (α)+α²+(a)² + α + α + 1 の値を求めよ。 (日) 2 思考プロセス 練習 61 九三 ド・モアブルの定理 一般に x" - 1 =(x-1)(x-1+xn-2 +･･･+1) 2 lal = COS n+isin 12/31 =1 19 1 +α+α² + α3 + α = 0 を代入する。 aa = |a|=1 1±√5 4x= 4 0 < =² / π < / kh 2 0<cos / <1 27/10 034²-4x=1 であることを示せ。 2章 複素数平面

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☐ 11. It ( ) you good. 2 lay バ 9. You look so tired. A week in Hawaii will ( 1 do 2 feel 3 make 4 turn 10. Joe's brave action ( ) him his life. 1 cost 2 missed 3 happened 4 killed ) light about 8 minutes to go from the sun to the earth. brings 2 needs 3 requires 4 takes 12. They ( ) me 10,000 yen for repairing my bicycle. priced 2 cost 3 spent 4 charged 13. I've already paid back what I () him. 1 received (2 lent 3 counted 4 owed 14. Global food prices have ( 1 raised ) sharply due to high biofuel demand. 3 risen 2 arisen 4 been arisen 15. My little brother ( ) down for a nap after a big lunch. 4 lied 3 lays 1 laid 9. 動詞の語法 ②

中3です。英検2級まであと4日なのですが、なにしたらよいですか？(合格率28%という絶望的なことを言われました) ⤵︎⤵︎⤵︎なんでもいいのでお願いします！

空欄に入る語句はhave that used car fixingでしょうか？ お願いします。 I want to ( ) before it breaks down on my way to work. A) have fixed that used car ... 続きを読む

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1 単語 英語の定義が表している語(句) を選んでみよう。 on the other hand 2 advice or directions the way someone or something acts in a slow way 5 to like someone or something better (meanwhile / as well) (reaction / guidance) (behavior / stubborn) (suddenly / gradually) (prefer / consider

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o use efties their ness d by und Target Vocabulary Match each word with the best meaning. 1. analyze confident creative easy-going nervous outgoing personality project psychology smoothly 2. 3. 4. 5. 6. 7. 8. 9. 10. a. worried or afraid of something in the future b. friendly and social c. carefully study and then describe, usually in research d. without strong opinions; flexible and relaxed e. a job; an assigned task f. sure of one's ability or success g. the actions, thinking, and emotions that describe a person h. able to imagine or make new things i. the study of the mind j. without sudden stops and starts Music and Dance

青ペンで丸をつけた「still」について質問ですが Stillには「しかも」 と言う意味の使い方があるんですか？？

performs actions that ne say (2) (3) (4) impossible is almost insulting. How can you remember everything the instructor says you 10 have to remember? Bend your knees. Look down the hill. Keep your weight on the downhill D ski. Keep your back straight, but nevertheless lean forward. The lectures seem endless how can you think about all that and still ski?

日本語に翻訳してくれる方いらっしゃいますか😭

F UXIT How many hours of sleep did you get last night? For years, scientists have tried to work out how long we should sleep to help our bodies and minds to function best. In 1951, two researchers at the University of Chicago made a breakthrough by identifying an important stage of sleep called REM sleep. 5 REM is an abbreviation for Rapid Eye Movement and the name comes from 由来する。 AFG the very fast movement of the eyes during sleep. In REM sleep, the brain is active but the body is asleep. When a person is having dreams they are often in REM sleep. During this time, the eyes might move quickly in reaction to something seen in a dream. Someone in REM 10 sleep may wake up suddenly to a noise and be able to remember the dream in detail. ju While REM sleep is known as the body's sleep, non-REM sleep is known as ryhmis the mind's sleep. During non-REM sleep, the brain relaxes while the body produces growth hormones so it can recover. About 80 percent of sleep is lat 15 non-REM sleep. If you sleep for seven to eight hours a night, only about one and a half hours are spent in REM sleep. In one night, a person will continue to repeat a cycle of both REM and non-REM sleep, which lasts about 90 NEXU prinsteil minutes. HO Many people will repeat about five cycles each night to help them function 4 people 20 best. However, other people may need to repeat (fewer or more cycles. Interestingly, while Leonardo Da Vinci only slept for about 90 minutes per おりりない day, Einstein needed ten hours of sleep. Still, both of them became famous 海 for their artistic and scientific achieveme achievements. Perhaps they were getting just the right amount of rest for their bodies and minds(aby) 116 for their artistic and scientific の 95. godinu b many more most bady brain nch

数１の文字係数の方程式に関する問題です （２）のマーカーがひいてある部分を書く理由が分かりません 教えていただきたいです！ よろしくお願いします🙇

図83 文字係数の方程式 ★★★☆ 次のxについての方程式を解け。 (1) x2+(a-2x-2a=0 (2) ax²-2x-a=0 (3) ax-2ax+α = 0 (2) (3) 問題文では,単に「方程式」となっており,2次, 1次方程式とは限らない。 場合に分ける (x^2の係数) = 0 のとき 1次方程式を解く (2) (x2の係数) ≠ 0 のとき 2次方程式を解く(例題 82 参照) Action » 最高次の係数が文字のときは, 0かどうかで場合分けせよ (1) x²+(a-2)x-2a=0 より (x-2)(x+α)=0 x2+(a+β)x+αβ = 0 例題 よって x=2, -a のときaiinA 10 (2) (ア) a = 0 のとき, この方程式は (x+a)(x+β) = 0 -2x=0 これを解くと a=0のとき, 与えられ x=0 (イ) α = 0 のとき, 解の公式により た方程式は1次方程式と なる。 − (−1) ± √(−1)² — a · (–a) x= a 2次方程式 ax²+26′x + c = 0 α² +1>0 より, これは解として適する。 の解は [a=0 α = 0 のとき x = 0 -6± √b²-a ac x= (ア),(イ)より IS a a +0 a = 0 のとき x= ₂²&d=$(8) 思考のプロセス 1± √a² +1 a 1± √a² +1 Tica

have + O + done 「Ｏを〜してもらう／させる／される／する」を使った例文を教えてください