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

とい3.4解答解説おねがいします！

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皆さんはノートを撮る時なんのアプリを使っていますか？

解答と理由を教えてください。わかる限りでいいので

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2.4.6の答えわかる方いますか？汗

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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🤔

(2)で、xの式って x=Asinωt だと思うのですが、なぜcosなんですか？

数学Aの整数の性質のところです。 解ける人教えてください！

この問題もお願いします！