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Mathematics Senior High

高一三角関数 2枚目のピンクのところはわかるのですが、1枚目のピンクの部分がわかりません。どうしてこの範囲になるのですか。

zacoso+2-1+C2 基本 例題 147 三角関数の最大・最小(2) 文字係数を含む y=2acos0+2-sin20 20 (一貫≧≦基)の最大値をαの式で表せ。 2 y=ct zacose+1 |指針 前ページの基本例題 146と同様に2次関数の最大・最小問題に帰着させる。 ① まず, cos の1種類の式で表し, cos0=x とおくと ② 変数のおき換え 変域が変わる に注意すると 基本 146 y=x2+2ax+1 0≦x≦1 したがって,0≦x≦1における関数 y=x2+2ax+1の最大値を求める問題になる。 よって,軸x=-αと区間0≦x≦1の位置関係で、次のように場合を分ける。 軸が区間の [1] 中央より左側 [2] 中央と一致 [3] 中央より右側 237 1種類で表す HART 三角関数の式の扱い ++2at+1 sincos の変身自在に sin0+cos20=1 2 解答 y=2acos0+2-sin20 =cos20+2a cos 0+1 cos0=x とおくと -Sin =2acos0+2-(1-cos20 ) <sin20+ cos20=1 y=x2+2ax+1 +9² = 1 3=1-C 2 一覧 π であるから f(x)=x2+2ax+1 とすると f(x)=(x+a)2+1-02 y=f(x) のグラフは下に凸の放物線で,軸は直線x=-α 28 02 1 また, 区間 ①の中央の値は [1]、y=f(x) 2 10-1 F)-2a+2 軸 最大 [1] -a< すなわち ①>1の 2 2. 0-a 11 2 とき, 最大値は f12a2 1 [2]\ y=f(x) [2] とき, 最大値は の すなわち α=- -a=- 軸 2 2 最大最大 2a++2(+tax)-d'+1 cosだけで表す。 -d-a+1) xの変域に要注意! ①の範囲における y=x2+2ax+1の最大値 を求める。 ito+2a+2 <軸が, 区間 ① の中央よ 左側。 <軸が, 区間 ① の中央と -. [s] 4 章 2 三角関数の応用 0 1 1 x 2 > [3]-a 1/2 すなわち 2 とき,最大値は f(0)≠1 よって a> [5] Sfc² = 1 2 1/2のとき2+2, a- のとき 1 1 021-a1 (5-10)+ C-1-5-(s-as-1) -(s-as+ 192 Tu 練習 y=cos @tasino (0≦)の最大値をαの式で表せ。 1/2の [3] y=f(x) 最大 軸 ------ <軸が, 区間 ① の中央よ り右側。 答えでは, [2] と [3] を まとめた。

Resolved Answers: 1
English Junior High

写真の問題より、(3 )に入る言葉の模範解答がbigger,largerだったのですが私はmoreとかきました。moreだとバツにたりますかね?

Tony: What are you going to make a presentation about? Riku I'm going to introduce my idea for a new park. Here is a graph showing "Roles which people want for parks." I think parks serve many important roles. I want to make a wonderful new park in my town in the future. Tony: Great! Riku What is the most important role for parks for you? Tony: Well, I think "A place for eating" is the most important. Riku: I think that is important too. But its percentage is the lowest in this graph. Roles which people want for parks A hub for the community A place for exercise and sports A place for children to play A place for relaxing A place for eating 0% 10% 20% 30% 40% Tony Interesting. In my country, I often enjoy eating lunch in a park. Riku: I think "A place for children to play" is the most important. Many other people also want that role. Tony Yes. Its percentage is a little lower than that of "A place for exercise and sports" and "A hub for the community." But it's higher than the percentage for the other roles. Riku Parks can play a lot of roles in a town. I'll try to make a park that serves important roles. There are many possible roles for a park in a town. I hope people find good roles for my park. Tony: Great! I think your presentation will be really interesting. I want to know more about parks and towns. hub +0 <要約文> Riku is going to introduce his idea. He and Tony look at a graph that shows some (1) which people want for parks. As for the (2) important role for parks, Riku thinks it is "A place for children to play," but Tony thinks it is "A place for eating." According to the graph, the percentage of Riku's opinion is (③) than Tony's. Riku hopes to make a park that plays important roles.

Resolved Answers: 1