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若，且，则cos2α＝ ．
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高二下学期数学《》真题及答案
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化简=
cosα
﹣cosα
cos2α
﹣cos2α
下列公式是正确的
sin 2α+cos2α=1
sin 2α-cos2α=1
sin 2α+cos2α=-1
sin 2α-cos2α＝-1
化简=
cosα
﹣cosα
cos2α
﹣cos2α
下列公式是正确的
sin 2α= 2sin α cos α
sin 2α= cos2α-sin 2α
sin 2α= 21(1+ cos2 α)
sin 2α= 21(1- cos2 α)
设全集U=R则A∩B=
（cos2，1]
[cos2，1]
（﹣1，2）
（﹣1，cos2]
已知α为第四象限角且cosα﹣|sinα﹣cosα|=﹣求tanαsin2αcos2α的值.
若α∈0π且cos2α=sin+α则sin2α的值为.
已知sinα=+cosα且α∈0则sin2α=cos2α=.
要证明sin4θ－cos4θ＝2sin2θ－1过程为sin4θ－cos4θ＝sin2θ＋cos2θs
分析法
反证法
综合法
间接证明法
已知αβ∈0π且tanα＝2cosβ＝－.1求cos2α的值2求2α－β的值
若α∈0π且cosα+sinα=-则cos2α=．
下列公式是正确的
sin2 α= 2sin α? cos α
sin2 α= 21(1- cos2 α)
sin2 α= 21(1+ cos2 α)
sin2 α= 21sin αcosα
若则cos2α=.
若sinα=则cos2α=.
双扭线r=2acos2θ所围成图形的面积是
4a
cos2θdθ
4a
cos2θdθ
2a
cos2θdθ
若且则cos2α＝．
若sinα+βcosα﹣cosα+βsinα=则cos2β=．
若sin＋θ＝则cos2θ＝________.
已知cos的值则cos2的值为
1 2cos2
1 2cos
1 cos2
2 cos2
若则cos2θ=_____________
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3分学生应该尊重老师并在公共场所举止得体的建议值得考虑.respectbehaveworthwhile同位语从句 .
1分Thebooksweresointerestingthattheyinnotime. A.sold B.weresold C.hadbeensold D.wouldsell
7.5分Itseemsthatthenewsindustryhasoneprimaryfocuskeepingpeopleuptodateonthestoriesofthemomentprovidingthebestinsightintoeveryinstancewherethereaderscan'tbetherethemselves.Decadesagothismeantwhennewsbrokejournalistsscrambledtocoveritdeliveringthekeyfactsanalysisandinsight.Theytoldtheiraudienceswhattheyneededtocareaboutandwhatthejournaliststhoughtwasimportant.AllofthisarrivedonyourdoorstepwiththedeliveryofthemorningpaperorwassqueezedintoanhouroflocalandnationalnewsonyourTV. Butwhilethegoalsofanewsorganizationremainthesameastheywereintheheyday全盛时期ofWalterCronkiterevolutionaryforcesbehindthesceneshavefundamentallytransformedtherelationshipthatreadershavewiththenews. Asthenewsmovesfrominktoscreensandthemobileplatformbecomestheforcetobetakenseriouslyjournalistsandthepublicationsthatsupportthemarefacedwithnewchallengesthatextendwellbeyondgatheringthetopstoriesoftheday.Asourdigitalworldexpandsouroptionsfornewsbasedonthefocuswritingstyleviewpointanddesignpublishersarefacedwiththebalancingactofmaintainingthereputationasatrustednewssourcewhiledevelopingnewincentives动机inordertoensuretheirreadership. Whilethenegativeshavebeenwelldocumentedthisongoingevolutionhasalsoresultedinamajorstepforwardforthefutureofjournalism.Ithasforcednewsbrandstolistentotheiraudiencesandbeginaconversationthatforsolongwasone﹣sided.Afterallthewebisopenfordiscussionshouldn'tourjournalismbeaswell? Readersshouldfeelempoweredtonotonlyjointheconversationaboutthenewsbutalsojoinintheeffortoftellingthewholestory.Notonlyareourmobilephonesasourceforustowatchandreadthetopstoriesthey'realsonews﹣gatheringdevicesthatempowercitizenjournaliststofillintheblanksandprovideacomprehensivepictureofthenewslandscape. 1Whatdoestheauthorthinkofthenewsindustryinthepast? A.Therewasnoeasyaccesstonews. B.Journalistsdidn'toftencommentonnews. C.Journalistswereimportantindeliveringnews. D.Publishersdidnotcareaboutreadersthatmuch. 2Thechallengesthatpublishersarefacednowarecausedby. A.people'sdecreasinginterestinnews B.moreoptionsavailablefornews C.alackofideasfornewincentives D.abadreputationofthenewsindustry 3Whatdoesthetextmainlytalkabout? A.Readersshouldbesensitivetonewsaroundthem. B.Readersshouldtakeadvantageofthemobileplatform. C.Readersdon'thavetorelyonjournalistsfornewsnow. D.Readersnowcangetinvolvedintheprocessofdeliveringnews.
15分ManystudentswanttofindfriendsontheInternetasawayofpracticingtheirlanguageskillsandlearning1differentcultures.WiththeInternetfindingfriendshasbeenmuch2easyandsuchrelationshipiscalledkeypals.Howeveryoushouldtakecarewhen3findfriendsontheInternet. Firstlookforreviewsofyourchosensites4learnmoreaboutotherstudents'experiences.Don′tjoinserviceuntilyou5doyourresearch.Thenyou'dbetteruseanicknameratherthanyourrealnametoprotect6youandnevergivepersonal7informtoanyoneyourhomeaddressphonenumberandbirthday8include.What'smoreyoushouldstopcontactwithothersifyoufeeluncomfortablewiththetopicsofconversation. Meanwhileit'sbesttoaskappropriatequestionstolearnsomeone'spersonalexperience9mayhelpyouunderstand10wholeculture.Mostimportantlytellyourteachersparentsoreventhepoliceifaproblemarises.
3分很显然你应该为你的不守信用向她道歉.obvious
15分Doyouhavesuchkindofexperience?Inabusyoumaylookatastrangerbutnottoolong.Andifhesensesthathe1stareathemayfeeluncomfortable. Thesamehappensindailylife.Ifyouarelookedatformorethannecessaryyouwilllookatyourselfupanddowntosee2anythingiswrongwithyou.Ifnothinggoeswrongyouwillfeeluncomfortable.Eyesdospeakright? 3looktoolongatsomeonemayseemtoberude.Butthingsaredifferentwhen4comestoastareattheoppositesex.Ifaman5glanceatawomanformorethan10secondsthatmeanshewishestomakeherknowheisadmiringher.Normallythespeakerinconversationwilllookatthelistenerattimestomakesurethatthelistenerdoespayattentionto6theformerissaying.Apoorliarusuallymakeshimself7exposebylookingtoolongatthevictimsincehebelievesinthefalseideathattolookstraightintheeyeisasignofhonest8communicate.Actuallycontinuouseyecontactexistsinloversonlywhowillenjoylookingateachothergentlyforalongtimetoshowlovethatwordscannotconvey. 9evidenteyecontactshouldbedoneaccordingtothespecificsituationandtherelationship10twopeople.
15分Flyingcarsmaysoonbecomea1real.TherideshareserviceUberhasasked2expertfromNASAtheAmericanspaceagency3helpthecompanydevelopcarsthatcanfly. Uberplanstouseflyingvehicles4thefuturetoavoidtrafficinandaroundcities.Thecompanywantstousesmalltotallyelectricaircraft5couldtakeoffandlandlikeahelicopterontopofparkinggarages.Ubersaiditsflyingvehicleswouldbemuch6quietcostlesstooperateandproducelesspollutionthanhelicopters. OnepersoninSanFrancisco7writeonTwitterIusedtothinkflyingcarswasaridiculousidea.8IchangedmymindthismorningwhenIsatinheavytraffic.AnotherpersonaddedfromMumbaiIndiaI'mreadingaboutUber9hireaNASAengineertobuildflyingcarswhileI'mstuckintraffic.Thereishope. Theexpertpredictstherewillbeseveralearlymodelsofflyingcarsthatcan'tfly10theybutwithhumanpilotswithinonetothreeyears.
3分令我们欣慰的是很多保护区正在被建造以保护濒临灭绝的野生动植物免于被猎杀.reliefendangerprotect…from
如图所示A为地球赤道表面的物体B为环绕地球运行的卫星此卫星在距离地球表面的高度处做匀速圆周运动且向心加速度的大小为a已知地球同步卫星的轨道半径为6.6RR为地球的半径引力常量为G．则下列说法正确的是
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