学年

教科

質問の種類

数学 高校生

302の(4)なんですが解答の整理してに続く式変形がわかりません。

;>0であるから 解答編 23 =(Cosa - sina}-3+4(1+cosasina)} =(Cosa - sina X1+4sinacosa) =(cosa - sinaX1+2sin2a)=右辺 sin xcosェ 2cosエ +1)=D0 sin x=0 または cosエ=0 整理して ゆえに =2 または COSI= 1 1 301 cos'a = 0<x<2x であるから 1+ tan?a 1+? エ=0, エ 2.2 ー22 sin x=0 のとき 4 したがって 3 sin 2a =2sinacosa =2tanacosa.cosa COSI=0 のとき 1 1 2t =2tanacos?a=2t- 1+? COST=-のとき = 1+22 であるから 1+? cos2a = 2cos?a-1 したがって、解は -2-1= 1-? 1+? エ=0, 。 の 1+? 2 ら 302 (1) cos2.x =cos x から 303 (1) cos2x<sinx から COSa =- 1-2sinェ<sinx 2sin'ェ+ sinxー1>0 (sinx+12sinェー1)>0 2cos?x-1=cosx よって 2cos?x-cos x-1=0 よって 1 ゆえに (cosx -1(2coSx +1)=0 ゆえに ¥5 V5 -1 1 V5 +1 V5 sinx+120 であるから したがって cosx =1, -。 sinx+1キ0 かつ 2sinェ-1>0 e s 00 0<x<2x であるから よって sinxキー1 かつ sinx>- cosx =1 のとき x=0 (15-1) 1) 1 sinx>う 2 4 4 のとき すなわち COSX = ー a コら tanラ 2 4 したがって, 解は ズ=0,, 0<x<2x であるから、解は くく (2) cos2x2cosェから 2cos'ェー1Ncos'x cos"ェ-120 V5-1 (2) sin 2x =cosx から 2sin xcos x = coSx よって cosx(2sin x 1)=0 よって ゆえに (coSエ+1(cosxー1)20 coSIS-1, 1 8sx -1ScosxS1であるから ゆえに cosx =0 または sinx= よって m 3 1 0Sx<2x であるから 3 エー cosx=-1 または cosr=1 coSx =0 のとき xニ 2'2 3 2 0Sx<2であるから 1 sin x=- 5 ズ= 6'6 3 cosI=-1のとき ま=ま 2のとき coSエ=1のとき したがって, 解は (3) cosx+sin 2x>0 から エ=0 したがって,解は エ= 5 3 -π,った したがって, 解は エ=0,ま (3) 2cos2x +4cosx-1=0 から cosI+2sin まcosx>0 V6 2(2cos?x-1)+4cosx-1=0 よって cosx(2sinx+1)>0 (cosx>0 かつ 2sin x+1>0 または(coSIく0かつ 2sinx+1<0) 3 4cos?x+4cosx-3=0 (2cosx-1(2cosx+3)=0 よって ゆえに sin a ゆえに COSa 2cos x +3キ0であるから すなわち(cos.x>0 かつ sinx>- sina 2cos x -1=0 よって COS.x= 2 COsa 5 0Sx<2x であるから または(cosxく0 かつ sinxくー -4sin°a I sina) (4) sin x(1+cos2.x)+sin2.x(1+cosx)3D0 から sin x{1+(2cos"x-1)) +2sin xcos.x(1+cos.x)3D0 0Sx<2x であるから、 ① より a)

未解決 回答数: 1
英語 高校生

文章が何を言っているか掴めません。できれば部分的でもいいのでSVなどを振ってくれると嬉しいです

向想 く1 >次の英文を読んで、下の設問に答えよ。 Perhaps the single biggest mistaké we make when we say 'No' is to start from 'No'. , We derive our ‘No' from what we are against- the other's demand or behavior. A positive ‘No' calls on us to do the exact opposite and base our ‘No' on what we are for. Instead of starting from ‘'No', start from ‘Yes'. Root your ‘No' in a deeper 'Yes' -a Yes' to your core interests and to what truly matters. Nowhere didI learn this more clearly than from a relative of mine who suffered from a serious addiction to alcohol that nearly cost him and others their lives in a car accident. He tried many times to give up the habit but always failed. Then at the age of sixty, just when all hope seemed lost, he found in himself the will to say ‘'No' and stop drinking. The secret? “"When my first grandchild was born," he says, “I wanted more than anything to live long enough to see him grow up. It was his birth that motivated me to get treatment and stop drinking. Since then, for over fifteen years now, I have not touched a drop." His 'Yes' to being present for his grandchildren - to be able to play with them and see them grow - motivated his powerful ‘No' to alcohol. His story serves to illustrate an everyday paradoxical truth: the power of your ‘No' comes directly from the power of your 'Yes'. 1our Yes is the underlying purpose for which you are saying 'No', The first step in the method is to uncover the Yes' that lies behind your'No'.(1)The deeper you go into vour core motivation, the more powerful your Yes' will be and thus the more powerful your 'No'. aht ha Tt is ourselves. It is our 1*em ;TL

未解決 回答数: 1
英語 高校生

この教科書のレベルはどのくらいですか教えください この教科書でどのくらいのレベルの大学まで対応できますか?

1 On 10 February 2009, at a height of about 800 kilometers above Siberia, an American satellite collided the first such height [háit] satellite [séetalait] collide(d) [kaláid(id)] with an old Russian satellite. It was collision [kaligan] collision in the history of space development. As a result, fragment(s) [fráegmant(s)) debris [dabri:] more than 1,000 fragments of debris were scattered into space. 2 The image above shows the vast amount of space debris in orbit around Earth. Approximately 22,000 vast [váest] orbit [5:rbat] approximately [aprá:ksamatli) objects larger than 10 centimeters across are floating around Earth. Of these, about 16,000 are from known 10 considering [kansidarig) artificial [a:rtafijal] currently [ks:rantli] operation [a:paréifon] Considering that there are only about 1,000 artificial satellites currently in operation, the amount of Sources. space debris is astonishing. This space debris is not only due to the collision of satellites. For example, when rockets reach space, they s 15 leave behind surplus engines and fuel tanks. These objects remain in orbit as space debris. In addition, surplus s5:rplas] there are tools that astronauts have dropped while tool(s) [t:l(z)) astronaut(s) [astrand:t(s) aluminum [ala:manom per|par] working outside. Even a one-centimeter aluminum ball. when orbiting at a speed of around 10 kilometers per 0 bullet [bálat] second, is far more powerful than a bullet from a gun. gun [gán]

回答募集中 回答数: 0