上二つについて、なぜこれで距離が求めることができるのか、意味的に教えてください。変形すればこれがでてくることは分かります。

にーレ!才り 陽関数表示 ッーリ7(z) (ce ミミの) で表される曲線の長さんは ら ー の ァ= / +(登) dz 極座標表示 (裏技) 7ニナげ(の9) (o ミ9<2) で れる曲線の長さんは g 2 ニー 2上(字 ァ=/ ヴォ(名 dひ 基本的に Az が に述べておく 導出過程を大 三 V(Az)"二(Aの7 と近似 Ar = Hm = 要 AO Az の Aル / d9 な a89oスeV 結 7 げ(9) / 。 7 ニーテー cos の 地 Ds 2 のー7(のsnの= みみ 。 がの にり ェーテァ7cosの一了げ(の)cosの9 より りーティ7sin9ニ7の)sin9 より sin9二(の) cos9 = 空 話。 つ@ @ 9 77 ルルなN* 2 2 2 の7 9の ルル み 2 が デーニーィルルーーー =リリ[学- cosの9一rsin 7 圭一 の C @_V ( ) 帆 (芝) V ( HH ) (放 EE レーぅ / 3 V(和) (cos29+sim2 の) 上72(sim2 9 cos2 の) V(介) 7 次の曲線の長さア

この問題を読んでこの答えになる理由がわからないです、、、 3番ならわかるのですが、なぜ2番なんですか？？、

buyers could choose from. Onc thing producers paid little attention to was safety. It wasnt until the mid-1960s that consumers began to demand that all car companies include at least a few common safety features in new cars. These new standards eventually led to safety features such as seat belts and air bags. TDespite these safety features。 there are Over 1.250.000 deaths from car accidents and 10-15 milion injuries worldwide every Year. (ま1) nml : 、(後式のように) 決まって行うこと eons : 突飛な、型破りの 信人AOCP6KEE チールフイン (後部の両仙 =付いた、ひれないしは濾汰のデザイン) 46 | に当てはまる最も條たものを、それぞそれ

回答を作っていただけませんか？？？

TPidgim Emgish Wiar happcms win people necd to communicate but have no cemmon angnagef Youmay ja aken par in coavertions sak as tBiS er perhaps youve witmeswed on fmm a ore comfortablc distance. They gesturc. they talk with their hands and feet. and 一 somewhat surprisingly 一 they speak. as well. That is surprising becasse they really cannot hope tbat amyopc w山 undcrstand much morc than their moodLif hr or she camt undcrstand thr languagr_ But they go ahead and speak anyway. and we can understand bits and pieces of what they say by paying clow attcnGon to thc rrst of the communicstem A がggiz is a simplihied form of language dcvclopcd by speakkcrs who otherwise share no omon languamw This means oi course that pidgins begin in mmultiingual* stuations 一 where ai least two. and more likcly seweral languagcs cocxist. ( ) ). pidgins spring up in rading rmters or in areas umdcr industriabzation (including agricultursl industmahzation. tbat plantanion) They develop bere because the opportuniies for trade and work attractlarge mambers or people with diEernt native tongues Thc term pidgin dcvlopcd from apidgin pronumciatiop of busness: busncss Engish became pidgin English・ A pidgin in the technical snsc is a sort oflanguage scrving the meeds of a community. Thus a pidgn is not simply thc brokcn Engiish of a waiter in a ipreign restaurant (who spcaks his native language with his co-worikers). por is it an idiots verson ofa language. or a kind of inevitable deterioration* in tbe bands of barbarians*。 ( づ )。 robably the morc intelieeat and ambidoms people in s culpure who master the cpcrsy and couragw needed for the move to an industrial or market amea Somc pcopks gcl that pidgins smc wag becatsc cf the Best snd os way they py with hc structural patterns of their basc language。 In a scnsr.the charge is correct pidgins have no respect for the grammars of tbeir base angrages But 下i doesnt make pidgins wrong since he radical simphification we find in pidgins servcs a worthwisls gpal- communicahon。 Because ofits simple structure a pidgin is easier to learn than other languagcs_ By providing a means of communication in a community. it fac抽tates tbe integration* of newcomers who would have a much more dificult time larning a standard Europcan language_ Tinaly. mdgins rc a reahty whosc cxistcpce is pot bject to dkbate。 Tbcr re dozeps of dgins. many of which show no signs of dying out Since tey arisc sponiapeously wherever people need to talk. pidgins probably represcnt the primative communication system out of which our more respected modern languages dcveloped。 This fact alonc makes them wel orth our attenton aped tom umeaer rax 3 cawos pe 23rの4 ne Os Se tee Dame e Leezaet ras ea PT ーッー

この長文の1部の訳を教えて欲しいです🙇

ars ago,he already had four small children from When Imarried mV husband、 hiS preViQuS arriage。 Tbecame their Stepmothers and Watched them becornc Young teenagers。 Although they jived primarily W arncd tO adjust。 We enjoyed Vacations toOgether、 ith their mother、they spent a lot of dme Nuith us as well、Over he years、We al ]ea ae family meals、WorKcd on homework、 played bi hat li sider。 Since I had no children of my Own、 my limited Q my husband's four、 and often I felt sad because eball、 rented videos。 FIOWeVer。 志 condinued tQ fe eNperience Qf parenting W T OUuId never knQW the special bOnd that exiSts betvecn DaTCnt and a child. Hen the Children moved tO a Own that was a fiVe-hour drive aWayx my husband as understandably upset We promptly set up an e-mail and chatline serVice。 っ) LDS This technology、 combined with the telephone, would enable us to reach the children on a daily baSiS by sending frequent notes and ImesSageS。 and even chatting together When we were all on-line.

有効数字についてです 下線部の箇所19.6m→20mにするのがなぜかわかりません🤔

Question Use the prompts to write questions using the best tense: simple present, present continuous, or present perfect. you/always/ch... Read More

simple is best と simple is the best どちらが正しいのですか？ 最上級の表現なのでやっぱり後者の方が正しいのでしょうか？

4番の答えを教えてください🙇‍♀️

全部が分かりません 教えてください お願いいたします

分かるところだけでも教えてください(｡_｡*)