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English Senior High

この3つが分かりません。教えてください🙇‍♀️

wal Rainforest trees are used to make things which we use every day. Rubber, for example, is used to make many things. The fruits of many forest trees ( 7 ) — forest people have eaten them for thousands of years. Today, all over the world, people eat rainforest food plants; for example, coffee, tea, oranges, and rice. Corn, which is an important food for many people of the world, is another rainforest plant. In 1970, a disease destroyed half the corn in the United States of America. Scientists began to look for new species in the rainforests. In 1987, in the Mexican rainforest, they found a new species which is stronger than other species. But we nearly lost this new species, because people were already cutting down that part of the Mexican rainforest. Hollywood, Los Angele movie stud (1) knows how many useful plants are already lost because people have SHOULD destroyed many of the rainforests of the world. Directors, actors, and writ The trees of the rainforests help the Earth's air because their leaves use carbon dioxide and make oxygen, which we need to live. its high point in these year They are also important because they control some of the Earth's weather. Through they give out water vapor which makes heavy clouds. The clouds then move to other parts of the Earth and give rain. The clouds also protect the Earth their large leaves, from the sun. (ウ) 日 moved to like Today, the Earth is slowly getting hotter, and in some places changes in the weather are making life much more difficult. We need to learn more about the Earth's weather while we still have the rainforests. and see the golden

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Mathematics Senior High

どちらも媒介変数を用いて表される曲線なんですが、 媒介変数を消去する場合と、媒介変数がのこったまま微分して増減表を書く場合があるのはなぜですか? 2つの場合の見分け方はありますか?

第5 150 82 媒介変数で表された関数のグラフ 64 精講 (1) Cのグラフをかけ. (0≤0≤2) S (2) 点Pの座標を求めよ。 れる曲線C上の点Pにおける接線がx軸の正方向との角をなすとき、 LUI xy平面上で媒介変数0を用いて また, また, 直線とx軸の正方向とのなす角をαとすると(ただし, 場面以前に の直線の傾きは tanα で表せます. (数学ⅡI・B58) gol (1) 00 <2πのとき, dx -=1-cos0, ARE de d'y dx² よって, グラフは上に凸. (1) 媒介変数で表された関数の微分については 64で学びました。 ここでは,それを用いてグラフをかく練習をしましょう。最大の ヤマは増減表のかき方です. 解答の中では,スペースの関係上、 dy をそのまま (途中を省略して) 使ってあります。 dy =0 より dx dy lim- 0+0 dx =lim - 0+0 =lim dy do 0-2=t とおくと RICE 解答 0+0 sine = sino より (1-cos0)² 1-cos0>0 だから 増減は右表のよう になる.また, 1 () -<0 sin 0(1+cos 0) 1-cos²0 . x=0-sine Ly=1-cos0 0 1+cos0 0 dy dx π -=+∞ = 良という流れ sine 1-cos o =(gol)-) sin0=0 ∴.0=π (0<0<2πより) 0 -<«< ²), ² 注参照 0 0=igol)il 1 71 0 |64| π X dy dx y0 > 2 ... Tπ + 0 : : T 2T [注

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