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發表於:2021-10-11
問題詳情:已知sin(α+)=-,α∈(0,π).(1)求的值;(2)求cos(2α-)的值.【回答】知識點:三角恆等變換題型:解答題...
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發表於:2020-03-25
問題詳情:已知a,b,c分別是△ABC的三個內角A、B、C所對的邊,A、B、C成等差數列.(1)若a=1,b=,求sinC;(2)若a,b,c成等差數列,求*△ABC是等邊三角形.【回答】解(1)由A+B+C=π,2B=A+C得B=,由=,得=,得sinA=,又0<a<b,∴A=,∴C=π...
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發表於:2018-12-17
Venialsinormortalsin?Repentancealonedidnotcanceloutsuchmortalsin.IsitamortalsinnottoparticipateinMassonSundaysandholydaysofobligation?Notforanymortalsin,butthewickednesso...
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發表於:2021-04-10
問題詳情:sin(﹣300°)=.【回答】.【考點】誘導公式的作用.【分析】由sin(α+2π)=sinα及特殊角三角函數值解之.【解答】解:sin(﹣300°)=sin(360°﹣300°)=sin60°=,故*爲.【點評】本題考查誘導公式及特殊...
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發表於:2020-01-22
問題詳情:cos(α-35°)cos(α+25°)+sin(α-35°)sin(α+25°)=_____.【回答】.知識點:三角恆等變換題型:填空題...
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發表於:2022-09-03
問題詳情:已知cos(α﹣)=﹣,sin(﹣β)=,且0<β<<α<π,則sin=.【回答】.【考點】三角函數的化簡求值.【分析】利用同角三角函數的基本關係求得sin(α﹣)和cos(﹣β)的值,再利用兩角差的正弦公式求得sin的值.【解答】解...
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發表於:2021-04-26
問題詳情:_____hespeakssoftlyisnoproofthatheiskind. A. Since B. As C. ThatD. Because【回答】C知識點:相似相近詞比較題型:選擇題...
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發表於:2017-07-31
經典語錄我一直在反覆提醒自己,永遠不要因爲外界因素而改變你的善良。別人沒有公德心,污染環境亂闖馬路,你也隨地吐痰頂着紅燈撒丫子跑。別人鋪張浪費大手大腳,你也唾沫星子橫飛,跟人大談名...
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發表於:2020-02-27
問題詳情:已知sin(+α)=,則sin(-α)的值爲________. 【回答】 知識點:三角函數題型:填空題...
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發表於:2021-01-19
問題詳情:求值:sin(-1200°)·cos1290°+cos(-1020°)·sin(-1050°)+tan945°.【回答】解:原式=-sin1200°·cos1290°+cos1020°·(-sin1050°)+tan945°=-sin120°·cos210°+cos300°·(-sin330°)+ta...
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發表於:2017-02-09
That'scardinalsinnumberone.Andwe'llsayitagain:Usingthesamepasswordformultipleaccountsisacardinalsininthesecurityworld,somakesureyoumixitup,evenwithaccountsyourarelyuse....
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發表於:2024-01-03
1、Hewaspleasanterthanoriginalsin.2、Butwhatistheoriginalsin?3、Mansevilnature,originalsinanddegeneration;4、asincommittedofyourownfreewill(ascontrastedwithoriginalsin).5...
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發表於:2018-06-10
Envyisnotjustadeadlysin,itisalsoanemotionalreality.unreasonableandinordinateself-esteem(personifiedasoneofthedeadlysins).ThemostdeadlysingletornadoinAmericasince1947hitJo...
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發表於:2017-02-14
Doyoucondonehissin?Iguessignorancemustbeasin.JesusChristredeemedmenfromsin.There'snothinginherentlysupernaturalaboutsin.Sostopseeingyourselfassomeonewhohastosin.Stopchoo...
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發表於:2021-01-20
問題詳情:—WhichcountryistheStatueofLibertyin?—It'sin________.A.B.C.D.【回答】C知識點:其他題型:選擇題...
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發表於:2021-02-27
問題詳情:---HaveyouknownDr.Jacksonforalongtime? ---Yes,sinceshe theChineseSociety. A.hasjoined B.joins ...
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發表於:2021-10-17
問題詳情:若sin(π-α)=-且α∈,則sin=()A.- B.- C. D.【回答】A知識點:三角恆等變換題型:選擇題...
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發表於:2021-11-23
問題詳情:—Sir,couldIhandinmyhomeworkabitlate?----- ,sinceyou’vebeenunwellthesedays.A.Youcan’tbeserious B.I’mafraidnotC.Goodidea ...
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發表於:2021-06-02
問題詳情:--WhichcountryistheOperaHousein? --It'sin_______. 【回答】D知識點:其他題型:選擇題...
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發表於:2019-12-29
問題詳情:已知0<<,sin=.(1)求tan的值;(2)求cos2+sin的值.【回答】解:(1)因爲0<<,sin=,故cos=,所以tan=.(2)cos2+sin=1-2sin2+sin=-+=.知識點:三角函數題型:解答題...
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發表於:2021-02-25
問題詳情:若sin=,則sin()=( )A. B. C. D. 【回答】A知識點:三角函數題型:選擇題...
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發表於:2021-08-21
問題詳情:若sin(125°-α)=,則sin(α+55°)= .【回答】.知識點:三角函數題型:填空題...
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發表於:2020-12-28
問題詳情:sin,則tan=_____________。【回答】-;知識點:三角函數題型:填空題...
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發表於:2019-12-18
問題詳情:已知,0<β<,cos(-α)=,sin(+β)=,求sin(α+β)的值.【回答】∵sin(α+β)=-cos[+(α+β)]=-cos[(+β)-(-α)]=-[cos(+β)cos(-α)+sin(+β)sin(-α)]∵<α< <-α< <-α<0,0<β< <+β<π.∴sin(-α)===,co...
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發表於:2017-09-25
Lazinessismybesettingsin.Hisbesettingsinislaziness.Castingreflectionsonothersisherbesettingsin.Dickwasafineperson,apartfromhisbesettingsin-hedranktoomuch....