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專題01三角函數(shù)的圖像與性質(zhì)1、(2023年新課標(biāo)全國Ⅰ卷)已知函數(shù)SKIPIF1<0在區(qū)間SKIPIF1<0有且僅有3個零點,則SKIPIF1<0的取值范圍是________.【答案】SKIPIF1<0【詳解】因為SKIPIF1<0,所以SKIPIF1<0,令SKIPIF1<0,則SKIPIF1<0有3個根,令SKIPIF1<0,則SKIPIF1<0有3個根,其中SKIPIF1<0,結(jié)合余弦函數(shù)SKIPIF1<0的圖像性質(zhì)可得SKIPIF1<0,故SKIPIF1<0,故答案為:SKIPIF1<0.2、(2023年新高考天津卷)已知函數(shù)SKIPIF1<0的一條對稱軸為直線SKIPIF1<0,一個周期為4,則SKIPIF1<0的解析式可能為(

)A.SKIPIF1<0 B.SKIPIF1<0C.SKIPIF1<0 D.SKIPIF1<0【答案】B【詳解】由函數(shù)的解析式考查函數(shù)的最小周期性:A選項中SKIPIF1<0,B選項中SKIPIF1<0,C選項中SKIPIF1<0,D選項中SKIPIF1<0,排除選項CD,對于A選項,當(dāng)SKIPIF1<0時,函數(shù)值SKIPIF1<0,故SKIPIF1<0是函數(shù)的一個對稱中心,排除選項A,對于B選項,當(dāng)SKIPIF1<0時,函數(shù)值SKIPIF1<0,故SKIPIF1<0是函數(shù)的一條對稱軸,故選:B.3、(新2023年課標(biāo)全國Ⅱ卷)已知函數(shù)SKIPIF1<0,如圖A,B是直線SKIPIF1<0與曲線SKIPIF1<0的兩個交點,若SKIPIF1<0,則SKIPIF1<0______.

【答案】SKIPIF1<0【詳解】設(shè)SKIPIF1<0,由SKIPIF1<0可得SKIPIF1<0,由SKIPIF1<0可知,SKIPIF1<0或SKIPIF1<0,SKIPIF1<0,由圖可知,SKIPIF1<0,即SKIPIF1<0,SKIPIF1<0.因為SKIPIF1<0,所以SKIPIF1<0,即SKIPIF1<0,SKIPIF1<0.所以SKIPIF1<0,所以SKIPIF1<0或SKIPIF1<0,又因為SKIPIF1<0,所以SKIPIF1<0,SKIPIF1<0.故答案為:SKIPIF1<0.4、(2023年全國乙卷數(shù)學(xué)(文)(理))已知函數(shù)SKIPIF1<0在區(qū)間SKIPIF1<0單調(diào)遞增,直線SKIPIF1<0和SKIPIF1<0為函數(shù)SKIPIF1<0的圖像的兩條對稱軸,則SKIPIF1<0(

)A.SKIPIF1<0 B.SKIPIF1<0 C.SKIPIF1<0 D.SKIPIF1<0【答案】D【詳解】因為SKIPIF1<0在區(qū)間SKIPIF1<0單調(diào)遞增,所以SKIPIF1<0,且SKIPIF1<0,則SKIPIF1<0,SKIPIF1<0,當(dāng)SKIPIF1<0時,SKIPIF1<0取得最小值,則SKIPIF1<0,SKIPIF1<0,則SKIPIF1<0,SKIPIF1<0,不妨取SKIPIF1<0,則SKIPIF1<0,則SKIPIF1<0,故選:D.5、(2023年全國甲卷數(shù)學(xué)(文)(理)).已知SKIPIF1<0為函數(shù)SKIPIF1<0向左平移SKIPIF1<0個單位所得函數(shù),則SKIPIF1<0與SKIPIF1<0的交點個數(shù)為(

)A.1 B.2 C.3 D.4【答案】C【詳解】因為SKIPIF1<0向左平移SKIPIF1<0個單位所得函數(shù)為SKIPIF1<0,所以SKIPIF1<0,而SKIPIF1<0顯然過SKIPIF1<0與SKIPIF1<0兩點,作出SKIPIF1<0與SKIPIF1<0的部分大致圖像如下,

考慮SKIPIF1<0,即SKIPIF1<0處SKIPIF1<0與SKIPIF1<0的大小關(guān)系,當(dāng)SKIPIF1<0時,SKIPIF1<0,SKIPIF1<0;當(dāng)SKIPIF1<0時,SKIPIF1<0,SKIPIF1<0;當(dāng)SKIPIF1<0時,SKIPIF1<0,SKIPIF1<0;所以由圖可知,SKIPIF1<0與SKIPIF1<0的交點個數(shù)為SKIPIF1<0.故選:C.6、【2022年全國甲卷】將函數(shù)f(x)=sinωx+π3(ω>0)的圖像向左平移π2個單位長度后得到曲線C,若A.16 B.14 C.1【答案】C【解析】由題意知:曲線C為y=sinωx+π2+π解得ω=13+2k,k∈Z,又ω>0,故當(dāng)k=0時,故選:C.

7、【2022年全國甲卷】設(shè)函數(shù)f(x)=sinωx+π3在區(qū)間A.53,136 B.5【答案】C【解析】:依題意可得ω>0,因為x∈0,π,所以ωx+要使函數(shù)在區(qū)間0,π恰有三個極值點、兩個零點,又y=sinx,則5π2<ωπ+π3≤3π故選:C.

8、【2022年全國乙卷】函數(shù)fx=cosA.?π2,π2 B.【答案】D【解析】f'所以fx在區(qū)間0,π2和3π2,2在區(qū)間π2,3π2上又f0=f2π=2所以fx在區(qū)間0,2π上的最小值為?3π故選:D

9、【2022年新高考1卷】記函數(shù)f(x)=sin(ωx+π4)+b(ω>0)的最小正周期為T.若2π3<T<πA.1 B.32 C.5【答案】A【解析】由函數(shù)的最小正周期T滿足2π3<T<π,得2π3又因為函數(shù)圖象關(guān)于點(3π2,2)對稱,所以3π所以ω=?16+23所以f(π故選:A題組一、三角函數(shù)圖像的變換1-1、(2023·安徽合肥·統(tǒng)考一模)將函數(shù)SKIPIF1<0圖像上各點橫坐標(biāo)縮短到原來的SKIPIF1<0,再向左平移SKIPIF1<0個單位得到曲線C.若曲線C的圖像關(guān)于SKIPIF1<0軸對稱,則SKIPIF1<0的值為(

)A.SKIPIF1<0 B.SKIPIF1<0 C.SKIPIF1<0 D.SKIPIF1<0【答案】B【分析】先根據(jù)圖像變化得到曲線C為:SKIPIF1<0,由圖像關(guān)于SKIPIF1<0軸對稱得SKIPIF1<0,進而可求得答案.【詳解】由題意得變化后的曲線C為:SKIPIF1<0,曲線C的圖像關(guān)于SKIPIF1<0軸對稱,故SKIPIF1<0,又SKIPIF1<0,即當(dāng)SKIPIF1<0,故選:B.1-2、(2023·云南紅河·統(tǒng)考一模)已知函數(shù)SKIPIF1<0.若SKIPIF1<0為偶函數(shù).SKIPIF1<0的圖象與x軸交點的橫坐標(biāo)構(gòu)成一個公差為SKIPIF1<0的等差數(shù)列.將函數(shù)SKIPIF1<0圖象上每一點的橫坐標(biāo)縮短為原來的SKIPIF1<0,縱坐標(biāo)不變,再向左平移SKIPIF1<0個單位后得到函數(shù)SKIPIF1<0的圖象,則SKIPIF1<0(

)A.0 B.-2 C.1 D.-1【答案】A【分析】根據(jù)題意得到函數(shù)的周期和對稱軸,然后再利用三角函數(shù)圖像的變換即可求解.【詳解】由SKIPIF1<0的圖象與x軸交點的橫坐標(biāo)構(gòu)成一個公差為SKIPIF1<0的等差數(shù)列,可以得到函數(shù)SKIPIF1<0的周期SKIPIF1<0,SKIPIF1<0;由SKIPIF1<0為偶函數(shù),可得SKIPIF1<0的圖象關(guān)于直線SKIPIF1<0對稱,所以SKIPIF1<0,SKIPIF1<0,因為SKIPIF1<0,所以SKIPIF1<0,SKIPIF1<0,則SKIPIF1<0,將函數(shù)SKIPIF1<0圖象上每一點的橫坐標(biāo)縮短為原來的SKIPIF1<0,得到SKIPIF1<0,再向左平移SKIPIF1<0個單位得到函數(shù)SKIPIF1<0,所以SKIPIF1<0SKIPIF1<0.故選:A.1-3、(2022·山東萊西·高三期末)要得到SKIPIF1<0的圖象,只需將SKIPIF1<0的圖象()A.向左平行移動SKIPIF1<0個單位長度 B.向右平行移動SKIPIF1<0個單位長度C.向右平行移動SKIPIF1<0個單位長度 D.向左平行移動SKIPIF1<0個單位長度【答案】C【解析】:因為函數(shù)SKIPIF1<0,所以要得到SKIPIF1<0的圖象,只需將SKIPIF1<0的圖象向右平行移動SKIPIF1<0個單位長度,故選:C.1-4、(2023·河北唐山·統(tǒng)考三模)(多選)為了得到函數(shù)SKIPIF1<0的圖象,只需把余弦曲線SKIPIF1<0上所有的點(

)A.橫坐標(biāo)縮短到原來的SKIPIF1<0倍,縱坐標(biāo)不變,再把得到的曲線向右平移SKIPIF1<0B.橫坐標(biāo)縮短到原來的SKIPIF1<0倍,縱坐標(biāo)不變,再把得到的曲線向右平移SKIPIF1<0C.向右平移SKIPIF1<0,再把得到的曲線上各點橫坐標(biāo)縮短到原來的SKIPIF1<0倍,縱坐標(biāo)不變D.向右平移SKIPIF1<0,再把得到的曲線上各點橫坐標(biāo)縮短到原來的SKIPIF1<0倍,縱坐標(biāo)不變【答案】BC【詳解】函數(shù)SKIPIF1<0的圖象向右平移SKIPIF1<0個長度單位,得SKIPIF1<0,再將橫坐標(biāo)縮短為原來的SKIPIF1<0倍(縱坐標(biāo)不變),得SKIPIF1<0;函數(shù)SKIPIF1<0圖象將橫坐標(biāo)縮短為原來的SKIPIF1<0倍(縱坐標(biāo)不變),得SKIPIF1<0,再向右平移SKIPIF1<0個長度單位,得SKIPIF1<0,即SKIPIF1<0.故選:BC題組二、三角函數(shù)的解析式及性質(zhì)2-1、(2022·江蘇海安·高三期末)函數(shù)SKIPIF1<0的部分圖象如圖,則下列選項中是其一條對稱軸的是()A.SKIPIF1<0 B.SKIPIF1<0C.SKIPIF1<0 D.SKIPIF1<0【答案】C【解析】依題意,點SKIPIF1<0是函數(shù)SKIPIF1<0的圖象對稱中心,且SKIPIF1<0在函數(shù)SKIPIF1<0的一個單調(diào)增區(qū)間內(nèi),則SKIPIF1<0,即SKIPIF1<0,SKIPIF1<0,令函數(shù)SKIPIF1<0周期為SKIPIF1<0,由圖象知SKIPIF1<0,即有SKIPIF1<0,而SKIPIF1<0,則有SKIPIF1<0,因此,SKIPIF1<0,解得SKIPIF1<0,而SKIPIF1<0,則SKIPIF1<0,SKIPIF1<0,SKIPIF1<0,由SKIPIF1<0得函數(shù)SKIPIF1<0圖象的對稱軸:SKIPIF1<0,當(dāng)SKIPIF1<0時,SKIPIF1<0,當(dāng)SKIPIF1<0時,SKIPIF1<0,當(dāng)SKIPIF1<0時,SKIPIF1<0,即選項A,B,D不滿足,選項C滿足.故選:C2-2、(2023·黑龍江大慶·統(tǒng)考一模)函數(shù)SKIPIF1<0(SKIPIF1<0,SKIPIF1<0,SKIPIF1<0)的部分圖象如圖所示,將f(x)的圖象向右平移SKIPIF1<0個單位長度得到函數(shù)g(x)的圖象,則(

)A.SKIPIF1<0 B.SKIPIF1<0C.SKIPIF1<0 D.SKIPIF1<0【答案】C【分析】首先根據(jù)函數(shù)圖象得到SKIPIF1<0,再根據(jù)平移變換求解即可.【詳解】由圖知:SKIPIF1<0,則SKIPIF1<0,SKIPIF1<0,所以SKIPIF1<0,則SKIPIF1<0,即SKIPIF1<0.因為SKIPIF1<0,所以SKIPIF1<0,SKIPIF1<0,即SKIPIF1<0,SKIPIF1<0.因為SKIPIF1<0,得SKIPIF1<0,所以SKIPIF1<0.所以SKIPIF1<0SKIPIF1<0.故選:C.2-3、(2023·吉林通化·梅河口市第五中學(xué)??家荒#┖瘮?shù)SKIPIF1<0(SKIPIF1<0,SKIPIF1<0)的部分圖象如圖所示,為了得到SKIPIF1<0的圖象,只需將SKIPIF1<0的圖象(

)A.向左平移SKIPIF1<0個單位長度 B.向右平移SKIPIF1<0個單位長度C.向左平移SKIPIF1<0個單位長度 D.向右平移SKIPIF1<0個單位長度【答案】D【分析】由周期求出SKIPIF1<0,由五點法作圖求出SKIPIF1<0的值,可得SKIPIF1<0的解析式,再利用函數(shù)SKIPIF1<0的圖象變換規(guī)律,得出結(jié)論.【詳解】解:根據(jù)函數(shù)SKIPIF1<0(其中SKIPIF1<0,SKIPIF1<0的圖象,可得SKIPIF1<0,SKIPIF1<0,再根據(jù)五點法作圖,可得SKIPIF1<0,SKIPIF1<0,SKIPIF1<0.故把SKIPIF1<0圖象向右平移SKIPIF1<0個單位長度,可得到SKIPIF1<0的圖象,故選:D.2-4、(2023·江蘇南通·統(tǒng)考一模)(多選)函數(shù)SKIPIF1<0的部分圖象如圖所示,則(

)A.SKIPIF1<0B.SKIPIF1<0C.SKIPIF1<0的圖象關(guān)于點SKIPIF1<0對稱D.SKIPIF1<0在區(qū)間SKIPIF1<0上單調(diào)遞增【答案】ACD【分析】根據(jù)三角函數(shù)的圖象,先求得SKIPIF1<0,然后求得SKIPIF1<0,根據(jù)三角函數(shù)的對稱性、單調(diào)性確定正確答案.【詳解】SKIPIF1<0,SKIPIF1<0,由于SKIPIF1<0,所以SKIPIF1<0,所以A選項正確,B選項錯誤.SKIPIF1<0,當(dāng)SKIPIF1<0時,得SKIPIF1<0,所以SKIPIF1<0關(guān)于SKIPIF1<0對稱,C選項正確,SKIPIF1<0,當(dāng)SKIPIF1<0時,得SKIPIF1<0在SKIPIF1<0上遞增,則SKIPIF1<0在區(qū)間SKIPIF1<0上單調(diào)遞增,所以D選項正確.故選:ACD.2-5、(2023·安徽馬鞍山·統(tǒng)考三模)(多選)已知函數(shù)SKIPIF1<0(SKIPIF1<0),若函數(shù)SKIPIF1<0的部分圖象如圖所示,則關(guān)于函數(shù)SKIPIF1<0,下列結(jié)論正確的是(

)A.SKIPIF1<0的圖象關(guān)于直線SKIPIF1<0對稱B.SKIPIF1<0的圖象關(guān)于點SKIPIF1<0對稱C.SKIPIF1<0在區(qū)間SKIPIF1<0上的單調(diào)遞增區(qū)間為SKIPIF1<0D.SKIPIF1<0的圖象可由SKIPIF1<0的圖象向左平移SKIPIF1<0個單位得到【答案】ABC【詳解】根據(jù)函數(shù)SKIPIF1<0圖象可得:SKIPIF1<0,∴SKIPIF1<0,SKIPIF1<0,又SKIPIF1<0,故SKIPIF1<0,所以SKIPIF1<0.A:由SKIPIF1<0,得SKIPIF1<0的一條對稱軸為SKIPIF1<0,故A正確;B:當(dāng)SKIPIF1<0時,SKIPIF1<0,∴函數(shù)SKIPIF1<0圖象關(guān)于SKIPIF1<0對稱,故B正確;C:由SKIPIF1<0,得SKIPIF1<0,當(dāng)SKIPIF1<0時,SKIPIF1<0SKIPIF1<0,所以函數(shù)SKIPIF1<0在SKIPIF1<0上的單調(diào)遞增區(qū)間為SKIPIF1<0,故C正確;D:由SKIPIF1<0,得SKIPIF1<0,故D錯誤.故選:ABC.題組三、三角函數(shù)的性質(zhì)3-1、(2023·安徽合肥·統(tǒng)考一模)將函數(shù)SKIPIF1<0圖像上各點橫坐標(biāo)縮短到原來的SKIPIF1<0,再向左平移SKIPIF1<0個單位得到曲線C.若曲線C的圖像關(guān)于SKIPIF1<0軸對稱,則SKIPIF1<0的值為(

)A.SKIPIF1<0 B.SKIPIF1<0 C.SKIPIF1<0 D.SKIPIF1<0【答案】B【分析】先根據(jù)圖像變化得到曲線C為:SKIPIF1<0,由圖像關(guān)于SKIPIF1<0軸對稱得SKIPIF1<0,進而可求得答案.【詳解】由題意得變化后的曲線C為:SKIPIF1<0,曲線C的圖像關(guān)于SKIPIF1<0軸對稱,故SKIPIF1<0,又SKIPIF1<0,即當(dāng)SKIPIF1<0,故選:B.3-2、(2023·云南玉溪·統(tǒng)考一模)已知奇函數(shù)SKIPIF1<0圖像的相鄰兩個對稱中心間的距離為2π,將SKIPIF1<0的圖像向右平移SKIPIF1<0個單位得函數(shù)SKIPIF1<0的圖像,則SKIPIF1<0的圖像(

)A.關(guān)于點SKIPIF1<0對稱 B.關(guān)于點SKIPIF1<0對稱C.關(guān)于直線SKIPIF1<0對稱 D.關(guān)于直線SKIPIF1<0對稱【答案】B【分析】先根據(jù)條件求出SKIPIF1<0,SKIPIF1<0,進而結(jié)合三角函數(shù)的對稱中心及對稱軸辨析即可.【詳解】相鄰兩對稱中心的距離為SKIPIF1<0,則SKIPIF1<0,SKIPIF1<0.已知SKIPIF1<0為奇函數(shù),根據(jù)SKIPIF1<0可知SKIPIF1<0,則SKIPIF1<0,SKIPIF1<0.令SKIPIF1<0,SKIPIF1<0,故A錯誤,B正確;令SKIPIF1<0,SKIPIF1<0,故C、D錯誤.故選:B.3-3、(2023·湖南邵陽·統(tǒng)考三模)(多選題)已知函數(shù)SKIPIF1<0,則(

)A.SKIPIF1<0的最小正周期為SKIPIF1<0 B.SKIPIF1<0在SKIPIF1<0上單調(diào)遞增C.SKIPIF1<0的圖象關(guān)于直線SKIPIF1<0對稱 D.若SKIPIF1<0,則SKIPIF1<0的最小值為SKIPIF1<0【答案】BC【詳解】對于A,由函數(shù)SKIPIF1<0,則SKIPIF1<0,故A錯誤;對于B,由SKIPIF1<0,則SKIPIF1<0,因為函數(shù)SKIPIF1<0在SKIPIF1<0上單調(diào)遞增,所以SKIPIF1<0在SKIPIF1<0上單調(diào)遞增,故B正確;對于C,由SKIPIF1<0,則SKIPIF1<0,因為函數(shù)SKIPIF1<0的對稱軸為直線SKIPIF1<0SKIPIF1<0,故C正確;對于D,由SKIPIF1<0,則SKIPIF1<0,令SKIPIF1<0,解得SKIPIF1<0,因為函數(shù)SKIPIF1<0在SKIPIF1<0上單調(diào)遞增,在SKIPIF1<0上單調(diào)遞減,所以函數(shù)SKIPIF1<0在SKIPIF1<0上單調(diào)遞增,在SKIPIF1<0上單調(diào)遞減,故SKIPIF1<0,故D錯誤.故選:BC.3-4、(2023·江蘇南通·統(tǒng)考模擬預(yù)測)(多選題)已知函數(shù)SKIPIF1<0,下列說法正確的有(

)A.SKIPIF1<0在SKIPIF1<0上單調(diào)遞增B.若SKIPIF1<0,則SKIPIF1<0C.函數(shù)SKIPIF1<0的圖象可以由SKIPIF1<0向右平移SKIPIF1<0個單位得到D.若函數(shù)SKIPIF1<0在SKIPIF1<0上恰有兩個極大值點,則SKIPIF1<0【答案】BD【分析】根據(jù)正弦函數(shù)的圖像和性質(zhì)逐項進行驗證即可判斷求解.【詳解】令SKIPIF1<0,則SKIPIF1<0,即SKIPIF1<0的單調(diào)增區(qū)間為SKIPIF1<0,則SKIPIF1<0在SKIPIF1<0不單調(diào),故選項SKIPIF1<0錯誤;令SKIPIF1<0,則SKIPIF1<0或SKIPIF1<0,即SKIPIF1<0或SKIPIF1<0,由SKIPIF1<0,則SKIPIF1<0或SKIPIF1<0,SKIPIF1<0,即SKIPIF1<0或SKIPIF1<0,故選項SKIPIF1<0正確;SKIPIF1<0向右平移SKIPIF1<0個單位變?yōu)镾KIPIF1<0故選項SKIPIF1<0錯誤;對于SKIPIF1<0,SKIPIF1<0,SKIPIF1<0在SKIPIF1<0上恰有兩個極大值點,即SKIPIF1<0,即SKIPIF1<0,故選項SKIPIF1<0正確.故選:SKIPIF1<0.題組四、三角函數(shù)的性質(zhì)的綜合運用4-1、(2022·江蘇如東·高三期末)正弦信號是頻率成分最為單一的一種信號,因為這種信號的波形是數(shù)學(xué)上的正弦函數(shù)而得名,很多復(fù)雜的信號都可以通過多個正弦信號疊加得到,因而正弦信號在實際中作為典型信號或測試信號獲得廣泛應(yīng)用.已知某個信號的波形可以表示為f(x)=sinx+sin2x+sin3x.則()A.f(x)的最大值為3 B.π是f(x)的一個周期C.f(x)的圖像關(guān)于(π,0)對稱 D.f(x)在區(qū)間SKIPIF1<0上單調(diào)遞增【答案】C【解析】SKIPIF1<0取最大值1時,SKIPIF1<0,SKIPIF1<0,SKIPIF1<0取最大值1時,SKIPIF1<0,SKIPIF1<0取最大值1時,SKIPIF1<0,三者不可能同時取得,因此SKIPIF1<0,A錯;SKIPIF1<0與SKIPIF1<0不可能恒相等,SKIPIF1<0不可能是周期,B錯;SKIPIF1<0,所以SKIPIF1<0的圖象關(guān)于點SKIPIF1<0對稱,C正確;函數(shù)圖象是連續(xù)的,而SKIPIF1<0,SKIPIF1<0,因此SKIPIF1<0在SKIPIF1<0上不可能遞增,D錯誤.故選:C.4-2、(2023·遼寧·大連二十四中校聯(lián)考三模)(多選題)已知函數(shù)SKIPIF1<0在SKIPIF1<0上恰有三個零點,則(

)A.SKIPIF1<0的最大值為SKIPIF1<0B.SKIPIF1<0在SKIPIF1<0上只有一個極小值點C.SKIPIF1<0在SKIPIF1<0上恰有兩個極大值點D.SKIPIF1<0在SKIPIF1<0上單調(diào)遞增【答案】BD【詳解】A項,當(dāng)SKIPIF1<0時,SKIPIF1<0,由函數(shù)SKIPIF1<0恰有三個零點,可得SKIPIF1<0,解得SKIPIF1<0,所以SKIPIF1<0無最大值,因此A錯誤;B選項:由A選項知,SKIPIF1<0,則當(dāng)SKIPIF1<0,即SKIPIF1<0時,函數(shù)SKIPIF1<0取得極小值,即SKIPIF1<0在SKIPIF1<0上只有一個極小值點,因此B正確;C選項:當(dāng)SKIPIF1<0,即SKIPIF1<0時,此時SKIPIF1<0,函數(shù)SKIPIF1<0取得極大值,當(dāng)SKIPIF1<0,即SKIPIF1<0時,函數(shù)SKIPIF1<0取得極大值,但是SKIPIF1<0不一定在SKIPIF1<0內(nèi),因此C錯誤;D選項:當(dāng)SKIPIF1<0時,SKIPIF1<0,因為SKIPIF1<0,所以SKIPIF1<0,即SKIPIF1<0,而SKIPIF1<0在SKIPIF1<0上單調(diào)遞增,因此SKIPIF1<0在SKIPIF1<0上單調(diào)遞增,因此D正確,故選:BD.4-3、(2022·江蘇揚州·高三期末)(多選題)已知函數(shù)SKIPIF1<0(ω>0),下列說法中正確的有()A.若ω=1,則f(x)在SKIPIF1<0上是單調(diào)增函數(shù)B.若SKIPIF1<0,則正整數(shù)ω的最小值為2C.若ω=2,則把函數(shù)y=f(x)的圖象向右平移SKIPIF1<0個單位長度,所得到的圖象關(guān)于原點對稱D.若f(x)在SKIPIF1<0上有且僅有3個零點,則SKIPIF1<0【答案】BD【解析】依題意,SKIPIF1<0,對于A,SKIPIF1<0,SKIPIF1<0,當(dāng)SKIPIF1<0時,有SKIPIF1<0,因SKIPIF1<0在SKIPIF1<0上不單調(diào),所以SKIPIF1<0在SKIPIF1<0上不單調(diào),A不正確;對于B,因SKIPIF1<0,則SKIPIF1<0是函數(shù)SKIPIF1<0圖象的一條對稱軸,SKIPIF1<0,整理得SKIPIF1<0,而SKIPIF1<0,即有SKIPIF1<0,SKIPIF1<0,B正確;對于C,SKIPIF1<0,SKIPIF1<0,依題意,函數(shù)SKIPIF1<0,這個函數(shù)不是奇函數(shù),其圖象關(guān)于原點不對稱,C不正確;對于D,當(dāng)SKIPIF1<0時,SKIPIF1<0,依題意,SKIPIF1<0,解得SKIPIF1<0,D正確.故選:BD4-4、(2022·天津五十七中模擬預(yù)測)(多選)已知函數(shù)SKIPIF1<0的圖象向左平移SKIPIF1<0個單位長度后得到函數(shù)SKIPIF1<0的圖象,關(guān)于函數(shù)SKIPIF1<0,下列選項不正確的是(

).A.最小正周期為SKIPIF1<0 B.SKIPIF1<0C.SKIPIF1<0是偶函數(shù) D.當(dāng)SKIPIF1<0時SKIPIF1<0取得最大值【答案】CD【解析】SKIPIF1<0正確,SKIPIF1<0錯誤SKIPIF1<0的最小正周期SKIPIF1<0正確當(dāng)SKIPIF1<0時,SKIPIF1<0,解得SKIPIF1<0所以當(dāng)SKIPIF1<0時,SKIPIF1<0取得最大值,SKIPIF1<0錯誤故選:CD1、(2022·湖北江岸·高三期末)下列四個函數(shù)中,以SKIPIF1<0為最小正周期,其在SKIPIF1<0上單調(diào)遞減的是()A.SKIPIF1<0 B.SKIPIF1<0 C.SKIPIF1<0 D.SKIPIF1<0【答案】A【解析】SKIPIF1<0的最小正周期為SKIPIF1<0,在SKIPIF1<0上單調(diào)遞減,符合題意,故A正確;SKIPIF1<0不是周期函數(shù),故B錯誤;SKIPIF1<0中,SKIPIF1<0,則SKIPIF1<0,故SKIPIF1<0中在SKIPIF1<0時不是單調(diào)函數(shù),故C錯誤;SKIPIF1<0SKIPIF1<0,則SKIPIF1<0,故SKIPIF1<0中在SKIPIF1<0時不是單調(diào)函數(shù),故D錯誤,故選:A.2、(2022·湖南常德·高三期末)已知函數(shù)SKIPIF1<0(SKIPIF1<0,SKIPIF1<0,SKIPIF1<0)的部分圖象如圖所示,則下列四個結(jié)論中正確的是()A.若SKIPIF1<0,則函數(shù)f(x)的值域為SKIPIF1<0B.點SKIPIF1<0是函數(shù)f(x)圖象的一個對稱中心C.函數(shù)f(x)在區(qū)間SKIPIF1<0上是增函數(shù)D.函數(shù)f(x)的圖象可以由函數(shù)SKIPIF1<0的圖象向右平移SKIPIF1<0個單位長度得到【答案】A【解析】由題圖及五點作圖法得SKIPIF1<0,SKIPIF1<0,SKIPIF1<0,則SKIPIF1<0,SKIPIF1<0,故SKIPIF1<0.由SKIPIF1<0,得SKIPIF1<0,故SKIPIF1<0,函數(shù)f(x)在區(qū)間SKIPIF1<0上不是增函數(shù),故A正確,C錯誤;∵當(dāng)SKIPIF1<0時,SKIPIF1<0,所以點SKIPIF1<0不是函數(shù)f(x)圖象的一個對稱中心,故B錯誤;由SKIPIF1<0,將函數(shù)SKIPIF1<0的圖象向右平移SKIPIF1<0個單位長度得到SKIPIF1<0SKIPIF1<0的圖象,故D錯誤.故選:A.3、(2023·云南玉溪·統(tǒng)考一模)已知奇函數(shù)SKIPIF1<0圖像的相鄰兩個對稱中心間的距離為2π,將SKIPIF1<0的圖像向右平移SKIPIF1<0個單位得函數(shù)SKIPIF1<0的圖像,則SKIPIF1<0的圖像(

)A.關(guān)于點SKIPIF1<0對稱 B.關(guān)于點SKIPIF1<0對稱C.關(guān)于直線SKIPIF1<0對稱 D.關(guān)于直線SKIPIF1<0對稱【答案】B【分析】先根據(jù)條件求出SKIPIF1<0,SKIPIF1<0,進而結(jié)合三角函數(shù)的對稱中心及對稱軸辨析即可.【詳解】相鄰兩對稱中心的距離為SKIPIF1<0,則SKIPIF1<0,SKIPIF1<0.已知SKIPIF1<0為奇函數(shù),根據(jù)SKIPIF1<0可知SKIPIF1<0,則SKIPIF1<0,SKIPIF1<0.令SKIPIF1<0,SKIPIF1<0,故A錯誤,B正確;令SKIPIF1<0,SKIPIF1<0,故C、D錯誤.故選:B.4、(2023·江蘇南京·南京市秦淮中學(xué)??寄M預(yù)測)已知函數(shù)SKIPIF1<0,SKIPIF1<0既有最小值也有最大值,則實數(shù)SKIPIF1<0的取值范圍是(

)A.SKIPIF1<0 B.SKIPIF1<0 C.SKIPIF1<0或SKIPIF1<0 D.SKIPIF1<0【答案】C【分析】根據(jù)題意得到SKIPIF1<0或SKIPIF1<0,計算得到答案.【詳解】SKIPIF1<0,SKIPIF1<0則SKIPIF1<0函數(shù)有最小值也有最大值則SKIPIF1<0或SKIPIF1<0故選:SKIPIF1<0.5、(2023·江蘇泰州·泰州中學(xué)??家荒#┯浐瘮?shù)SKIPIF1<0的最小正周期為T.若SKIPIF1<0,且點SKIPIF1<0和直線SKIPIF1<0分別是SKIPIF1<0圖像的對稱中心和對稱軸,則T=(

)A.SKIPIF1<0 B.SKIPIF1<0 C.SKIPIF1<0 D.SKIPIF1<0【答案】A【分析】求出對稱中心和對稱軸之間的距離關(guān)系,根據(jù)周期的取值范圍即可確定周期的值【詳解】解:由題意在SKIPIF1<0中,設(shè)對稱點和與對稱軸在SKIPIF1<0軸上的交點間的距離為SKIPIF1<0對稱中心:SKIPIF1<0對稱軸:SKIPIF1<0由幾何知識得,SKIPIF1<0解得:SKIPIF1<0(SKIPIF1<0為屬于SKIPIF1<0的參數(shù))∵SKIPIF1<0,且點SKIPIF1<0和直線SKIPIF1<0分別是SKIPIF1<0圖像的對稱中心和對稱軸∴SKIPIF1<0解得:SKIPIF1<0∵SKIPIF1<0∴SKIPIF1<0,SKIPIF1<0故選:A.6、(2023·江蘇南京·??家荒#┮阎瘮?shù)SKIPIF1<0,SKIPIF1<0圖像上每一點的橫坐標(biāo)縮短到原來的SKIPIF1<0,得到SKIPIF1<0的圖像,SKIPIF1<0的部分圖像如圖所示,若SKIPIF1<0,則SKIPIF1<0等于(

)A.SKIPIF1<0 B.SKIPIF1<0 C.SKIPIF1<0 D.SKIPIF1<0【答案】A【分析】利用向量數(shù)量積的定義可得SKIPIF1<0,從而可得SKIPIF1<0,進而得出SKIPIF1<0,即SKIPIF1<0,求出SKIPIF1<0.【詳解】根據(jù)SKIPIF1<0SKIPIF1<0,可得SKIPIF1<0,故SKIPIF1<0,所以SKIPIF1<0,故SKIPIF1<0的周期為24,所以SKIPIF1<0,SKIPIF

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