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專題3-2三角函數(shù)求w類型及三角換元應(yīng)用歸類目錄TOC\o"1-1"\h\u題型01平移型求w 1題型02單調(diào)區(qū)間及單調(diào)性求w 2題型03對稱中心(零點)求w 3題型04對稱軸型求w 4題型05對稱軸及單調(diào)性型求w 5題型06“臨軸”型求w 6題型07“臨心”型求w 7題型08區(qū)間內(nèi)有“心”型求w 8題型09區(qū)間內(nèi)無“心”型求w 9題型10區(qū)間內(nèi)最值點型求w 10題型11多可能性分析型求w 10題型12三角應(yīng)用:三角雙換元 11題型13三角應(yīng)用:無理根號型 12題型14三角應(yīng)用:圓代換型 12題型15三角應(yīng)用:向量型換元 13高考練場 14題型01平移型求w【解題攻略】平移型求w,可以借助代入點的坐標,利用一些已知點(最高點、最低點或“零點”)坐標代入解析式,或者利用單調(diào)區(qū)間,再結(jié)合圖形解出SKIPIF1<0值或者范圍?!镜淅?-1】(2023·全國·高三專題練習(xí))已知函數(shù)SKIPIF1<0,將SKIPIF1<0的圖像向右平移SKIPIF1<0個單位長度后,若所得圖像與原圖像重合,則SKIPIF1<0的最小值等于(
)A.SKIPIF1<0 B.SKIPIF1<0 C.SKIPIF1<0 D.SKIPIF1<0【典例1-2】(2022·全國·高三專題練習(xí))將函數(shù)SKIPIF1<0的圖像向右平移SKIPIF1<0個單位長度后與原函數(shù)圖像重合,則實數(shù)SKIPIF1<0的最小值是(
)A.2 B.3 C.6 D.9【變式1-1】(2021春·浙江杭州·高三學(xué)軍中學(xué)??奸_學(xué)考試)將函數(shù)SKIPIF1<0的圖像向左平移2個單位長度后,與函數(shù)SKIPIF1<0的圖象重合,則SKIPIF1<0的最小值等于(
)A.SKIPIF1<0 B.1 C.SKIPIF1<0 D.2【變式1-2】(2024·云南楚雄·云南省楚雄彝族自治州民族中學(xué)校考一模)將函數(shù)SKIPIF1<0(SKIPIF1<0)的圖象向右平移SKIPIF1<0個單位長度后與函數(shù)SKIPIF1<0的圖象重合,則SKIPIF1<0的最小值為(
)A.1 B.2 C.4 D.5【變式1-3】(2023·陜西西安·西安市大明宮中學(xué)校考模擬預(yù)測)將SKIPIF1<0的圖象向左平移SKIPIF1<0個單位長度后與函數(shù)SKIPIF1<0的圖象重合,則SKIPIF1<0的最小值為(
)A.SKIPIF1<0 B.SKIPIF1<0 C.SKIPIF1<0 D.SKIPIF1<0題型02單調(diào)區(qū)間及單調(diào)性求w【解題攻略】正弦函數(shù)在每一個閉區(qū)間SKIPIF1<0(k∈Z)上都單調(diào)遞增,在每一個閉區(qū)間SKIPIF1<0(k∈Z)上都單調(diào)遞減余弦函數(shù)在每一個閉區(qū)間[2kπ-π,2kπ](k∈Z)上都單調(diào)遞增,在每一個閉區(qū)間[2kπ,2kπ+π](k∈Z)上都單調(diào)遞減【典例1-1】(上海市川沙中學(xué)2021-2022學(xué)年高三下學(xué)期數(shù)學(xué)試題)設(shè)SKIPIF1<0,若函數(shù)SKIPIF1<0在SKIPIF1<0上單調(diào)遞增,則SKIPIF1<0的取值范圍是________【典例1-2】(廣西玉林市育才中學(xué)2022屆高三12月月考數(shù)學(xué)試題)已知函數(shù)SKIPIF1<0的圖象關(guān)于直線SKIPIF1<0對稱,且SKIPIF1<0,SKIPIF1<0在區(qū)間SKIPIF1<0上單調(diào),則SKIPIF1<0的值為_____________.【變式1-1】函數(shù)SKIPIF1<0SKIPIF1<0,若SKIPIF1<0在區(qū)間SKIPIF1<0上是單調(diào)函數(shù),且SKIPIF1<0則SKIPIF1<0的值為()A.SKIPIF1<0 B.SKIPIF1<0或SKIPIF1<0 C.SKIPIF1<0 D.SKIPIF1<0或SKIPIF1<0【變式1-2】若函數(shù)SKIPIF1<0在SKIPIF1<0上是增函數(shù),則SKIPIF1<0的取值范圍是____________.【變式1-3】(2022-2021學(xué)年度下學(xué)期高三數(shù)學(xué)備考總動員C卷)若函數(shù)SKIPIF1<0在區(qū)間SKIPIF1<0上單調(diào)遞減,則實數(shù)SKIPIF1<0的取值范圍是________.題型03對稱中心(零點)求w【解題攻略】正弦函數(shù)對稱中心(kπ,0)(k∈Z)余弦函數(shù)對稱中心(eq\f(π,2)+kπ,0)(k∈Z)正切函數(shù)對稱中心(eq\f(kπ,2),0)(k∈Z)【典例1-1】(2023·全國·高三專題練習(xí))設(shè)函數(shù)SKIPIF1<0的圖象的一個對稱中心為SKIPIF1<0,則SKIPIF1<0的一個最小正周期是(
)A.SKIPIF1<0 B.SKIPIF1<0 C.SKIPIF1<0 D.SKIPIF1<0【典例1-2】(2022秋·重慶·高三統(tǒng)考期中)若存在實數(shù)SKIPIF1<0,使得函數(shù)SKIPIF1<0的圖象的一個對稱中心為SKIPIF1<0,則SKIPIF1<0的取值范圍為(
)A.SKIPIF1<0 B.SKIPIF1<0 C.SKIPIF1<0 D.SKIPIF1<0【變式1-1】(2023春·湖北荊州·高三沙市中學(xué)??茧A段練習(xí))已知SKIPIF1<0,周期SKIPIF1<0是SKIPIF1<0的對稱中心,則SKIPIF1<0的值為(
)A.SKIPIF1<0 B.SKIPIF1<0 C.SKIPIF1<0 D.SKIPIF1<0【變式1-2】(2022秋·高三課時練習(xí))已知函數(shù)SKIPIF1<0的部分圖象如圖,SKIPIF1<0的對稱中心是SKIPIF1<0,則SKIPIF1<0(
)A.SKIPIF1<0 B.SKIPIF1<0 C.3 D.SKIPIF1<0【變式1-3】(2023秋·江蘇蘇州·高三??茧A段練習(xí))設(shè)函數(shù)SKIPIF1<0的圖象的一個對稱中心為SKIPIF1<0,則SKIPIF1<0的一個最小正周期是(
)A.SKIPIF1<0 B.SKIPIF1<0 C.SKIPIF1<0 D.SKIPIF1<0題型04對稱軸型求w【解題攻略】正弦函數(shù)對稱軸SKIPIF1<0(k∈Z)時,ymax=1;SKIPIF1<0(k∈Z)時,ymin=-1余弦函數(shù)對稱軸x=2kπ(k∈Z)時,ymax=1;x=2kπ+π(k∈Z)時,ymin=-1【典例1-1】(2022秋·山西長治·高三山西省長治市第二中學(xué)校??茧A段練習(xí))已知函數(shù)SKIPIF1<0的部分圖象如圖,SKIPIF1<0的對稱軸方程為SKIPIF1<0,則SKIPIF1<0(
)A.3 B.2 C.SKIPIF1<0 D.1【典例1-2】(2022·全國·高三專題練習(xí))若SKIPIF1<0是函數(shù)SKIPIF1<0SKIPIF1<0圖象的對稱軸,則SKIPIF1<0的最小正周期的最大值是(
)A.SKIPIF1<0 B.SKIPIF1<0 C.SKIPIF1<0 D.SKIPIF1<0【變式1-1】(2021秋·云南昆明·高三昆明市第三中學(xué)校考階段練習(xí))已知函數(shù)SKIPIF1<0的圖像關(guān)于SKIPIF1<0對稱,則函數(shù)SKIPIF1<0的圖像的一條對稱軸是()A.SKIPIF1<0 B.SKIPIF1<0C.SKIPIF1<0 D.SKIPIF1<0【變式1-2】(“超級全能生”高考全國卷26省9月聯(lián)考乙卷數(shù)學(xué)試題)已知向量SKIPIF1<0,函數(shù)SKIPIF1<0,且SKIPIF1<0,若SKIPIF1<0的任何一條對稱軸與SKIPIF1<0軸交點的橫坐標都不屬于區(qū)間SKIPIF1<0,則SKIPIF1<0的取值范圍是()A.SKIPIF1<0 B.SKIPIF1<0C.SKIPIF1<0 D.SKIPIF1<0【變式1-3】已知向量SKIPIF1<0,函數(shù)SKIPIF1<0,且SKIPIF1<0,若SKIPIF1<0的任何一條對稱軸與SKIPIF1<0軸交點的橫坐標都不屬于區(qū)間SKIPIF1<0,則SKIPIF1<0的取值范圍是A.SKIPIF1<0 B.SKIPIF1<0C.SKIPIF1<0 D.SKIPIF1<0題型05對稱軸及單調(diào)性型求w【典例1-1】(2021屆重慶市南開中學(xué)高考沖刺二數(shù)學(xué)試題)已知函數(shù)SKIPIF1<0,對任意的SKIPIF1<0,都有SKIPIF1<0,且SKIPIF1<0在區(qū)間SKIPIF1<0上單調(diào),則SKIPIF1<0的值為___________.【典例1-2】(2020屆百校聯(lián)考高考百日沖刺金卷全國Ⅱ卷?數(shù)學(xué)(二)試題)已知函數(shù)SKIPIF1<0的一條對稱軸為SKIPIF1<0,且SKIPIF1<0在SKIPIF1<0上單調(diào),則SKIPIF1<0的最大值為()A.SKIPIF1<0 B.3 C.SKIPIF1<0 D.SKIPIF1<0【變式1-1】(四川省成都市新都區(qū)2020-2021學(xué)年高三診斷測試數(shù)學(xué)試題)已知函數(shù)SKIPIF1<0滿足SKIPIF1<0,SKIPIF1<0,且SKIPIF1<0在區(qū)間SKIPIF1<0上單調(diào),則SKIPIF1<0的最大值為________.【變式1-2】(2022·全國·高三專題練習(xí))已知函數(shù)SKIPIF1<0在SKIPIF1<0上是單調(diào)函數(shù),其圖象的一條對稱軸方程為SKIPIF1<0,則SKIPIF1<0的值可能是(
)A.SKIPIF1<0 B.SKIPIF1<0 C.1 D.SKIPIF1<0【變式1-3】(2023·內(nèi)蒙古赤峰·校考模擬預(yù)測)若直線SKIPIF1<0是曲線SKIPIF1<0的一條對稱軸,且函數(shù)SKIPIF1<0在區(qū)間[0,SKIPIF1<0]上不單調(diào),則SKIPIF1<0的最小值為(
)A.9 B.7 C.11 D.3題型06“臨軸”型求w【解題攻略】若SKIPIF1<0的圖像關(guān)于直線SKIPIF1<0對稱,則SKIPIF1<0或SKIPIF1<0.【典例1-1】(2023秋·四川綿陽·高三四川省綿陽南山中學(xué)校考開學(xué)考試)已知函數(shù)SKIPIF1<0的最大值為4,最小值為0,且該函數(shù)圖象的相鄰兩個對稱軸之間的最短距離為SKIPIF1<0,直線SKIPIF1<0是該函數(shù)圖象的一條對稱軸,則該函數(shù)的解析式是(
)A.SKIPIF1<0 B.SKIPIF1<0C.SKIPIF1<0 D.SKIPIF1<0【典例1-2】(2023秋·高三課時練習(xí))已知函數(shù)SKIPIF1<0,SKIPIF1<0是函數(shù)SKIPIF1<0的一個零點,SKIPIF1<0是函數(shù)SKIPIF1<0的一條對稱軸,若SKIPIF1<0在區(qū)間SKIPIF1<0上單調(diào),則SKIPIF1<0的最大值是(
)A.SKIPIF1<0 B.SKIPIF1<0 C.SKIPIF1<0 D.SKIPIF1<0【變式1-1】(2023秋·河南洛陽·高三洛寧縣第一高級中學(xué)校考階段練習(xí))已知SKIPIF1<0,SKIPIF1<0是函數(shù)SKIPIF1<0圖象上兩條相鄰的對稱軸,則SKIPIF1<0(
)A.SKIPIF1<0 B.SKIPIF1<0 C.SKIPIF1<0 D.SKIPIF1<0【變式1-2】(2023春·廣東佛山·高三??茧A段練習(xí))已知函數(shù)SKIPIF1<0,且SKIPIF1<0圖象的相鄰兩對稱軸間的距離為SKIPIF1<0.若將函數(shù)SKIPIF1<0的圖象向右平移SKIPIF1<0個單位后得到SKIPIF1<0的圖象,且當SKIPIF1<0時,不等式SKIPIF1<0恒成立,則SKIPIF1<0的取值范圍為(
)A.SKIPIF1<0 B.SKIPIF1<0C.SKIPIF1<0 D.SKIPIF1<0【變式1-3】(2023春·四川成都·高三校聯(lián)考階段練習(xí))已知直線SKIPIF1<0是函數(shù)SKIPIF1<0圖象的任意兩條對稱軸,且SKIPIF1<0的最小值為SKIPIF1<0,則SKIPIF1<0的單調(diào)遞增區(qū)間是(
)A.SKIPIF1<0 B.SKIPIF1<0C.SKIPIF1<0 D.SKIPIF1<0題型07“臨心”型求w【解題攻略】函數(shù)SKIPIF1<0的性質(zhì):(1)SKIPIF1<0.(2)周期SKIPIF1<0(3)由SKIPIF1<0求對稱軸,由SKIPIF1<0求對稱中心.(4)由SKIPIF1<0求增區(qū)間;由SKIPIF1<0求減區(qū)間.【典例1-1】(2023春·廣東珠?!じ呷?迹┮阎瘮?shù)SKIPIF1<0的圖象的一個對稱中心的橫坐標在區(qū)間SKIPIF1<0內(nèi),且兩個相鄰對稱中心之間的距離大于SKIPIF1<0,則SKIPIF1<0的取值范圍為(
)A.SKIPIF1<0 B.SKIPIF1<0 C.SKIPIF1<0 D.SKIPIF1<0【典例1-2】(2023上·天津東麗·高三天津市第一百中學(xué)??茧A段練習(xí))函數(shù)SKIPIF1<0,SKIPIF1<0的最大值為2,其圖象相鄰兩個對稱中心之間的距離為SKIPIF1<0,且SKIPIF1<0的圖象關(guān)于直線SKIPIF1<0對稱,則下列判斷正確的是(
)A.函數(shù)SKIPIF1<0在SKIPIF1<0上單調(diào)遞減B.將SKIPIF1<0圖象向右平移SKIPIF1<0個單位與原圖象重合C.函數(shù)SKIPIF1<0圖象關(guān)于點SKIPIF1<0對稱D.函數(shù)SKIPIF1<0的圖象關(guān)于直線SKIPIF1<0對稱【變式1-1】(2023下·河南焦作·高三統(tǒng)考)已知函數(shù)SKIPIF1<0的圖象的一個對稱中心的橫坐標在區(qū)間SKIPIF1<0內(nèi),且兩個相鄰對稱中心之間的距離大于SKIPIF1<0,則SKIPIF1<0的取值范圍為(
)A.SKIPIF1<0 B.SKIPIF1<0 C.SKIPIF1<0 D.SKIPIF1<0【變式1-2】(2023·云南紅河·統(tǒng)考二模)已知函數(shù)SKIPIF1<0(SKIPIF1<0)的圖象的兩個相鄰對稱中心之間的距離為SKIPIF1<0,則SKIPIF1<0(
)A.2 B.4 C.8 D.16【變式1-3】(2021上·四川雅安·高三統(tǒng)考期末)已知函數(shù)SKIPIF1<0,點SKIPIF1<0和SKIPIF1<0是其相鄰的兩個對稱中心,且在區(qū)間SKIPIF1<0內(nèi)單調(diào)遞減,則SKIPIF1<0()A.SKIPIF1<0 B.SKIPIF1<0 C.SKIPIF1<0 D.SKIPIF1<0題型08區(qū)間內(nèi)有“心”型求w【解題攻略】求w的表達式時,SKIPIF1<0中不要把SKIPIF1<0寫成k,因為后面還有一個k,SKIPIF1<0中不要把SKIPIF1<0寫成k,否則不好研究w的最小值.它們本身就不一定相等.【典例1-1】(天津市部分區(qū)2020屆高考二模數(shù)學(xué)試題)若函數(shù)SKIPIF1<0(SKIPIF1<0SKIPIF1<0)在區(qū)間SKIPIF1<0上單調(diào)遞減,且在區(qū)間SKIPIF1<0上存在零點,則SKIPIF1<0的取值范圍是()A.SKIPIF1<0 B.SKIPIF1<0 C.SKIPIF1<0 D.SKIPIF1<0【典例1-2】(2021春?商洛)已知函數(shù)SKIPIF1<0在SKIPIF1<0,SKIPIF1<0上恰有6個零點,則SKIPIF1<0的取值范圍是SKIPIF1<0SKIPIF1<0A.SKIPIF1<0 B.SKIPIF1<0 C.SKIPIF1<0 D.SKIPIF1<0【變式1-1】(2022?湖北模擬)已知函數(shù)SKIPIF1<0在區(qū)間SKIPIF1<0,SKIPIF1<0上恰有三個零點,則SKIPIF1<0的取值范圍是SKIPIF1<0.【變式1-2】(云南省2020屆高三適應(yīng)性考試數(shù)學(xué)試題)若函數(shù)SKIPIF1<0(SKIPIF1<0,SKIPIF1<0)圖象過點SKIPIF1<0,SKIPIF1<0在SKIPIF1<0上有且只有兩個零點,則SKIPIF1<0的最值情況為(
)A.最小值為SKIPIF1<0,最大值為SKIPIF1<0 B.無最小值,最大值為SKIPIF1<0C.無最小值,最大值為SKIPIF1<0 D.最小值為SKIPIF1<0,最大值為SKIPIF1<0【變式1-3】(2021年全國高考甲卷數(shù)學(xué)(理)試題變式題16-20題)設(shè)函數(shù)SKIPIF1<0,若對于任意實數(shù)SKIPIF1<0,SKIPIF1<0在區(qū)間SKIPIF1<0上至少有2個零點,至多有3個零點,則SKIPIF1<0的取值范圍是________.題型09區(qū)間內(nèi)無“心”型求w【解題攻略】無“心”型求w,可以采用正難則反的策略把無交點問題轉(zhuǎn)化為有交點的問題,利用補集思想得到最終的結(jié)果,對于其他否定性問題經(jīng)常這樣思考.【典例1-1】已知函數(shù)SKIPIF1<0,若函數(shù)SKIPIF1<0在區(qū)間SKIPIF1<0內(nèi)沒有零點,則SKIPIF1<0的取值范圍為_________.【典例1-2】(天津市南開中學(xué)2022屆高三下學(xué)期統(tǒng)練二數(shù)學(xué)試題)已知函數(shù)SKIPIF1<0,SKIPIF1<0,若SKIPIF1<0在區(qū)間SKIPIF1<0內(nèi)沒有零點,則SKIPIF1<0的取值范圍是______.【變式1-1】函數(shù)SKIPIF1<0,且SKIPIF1<0,SKIPIF1<0,若SKIPIF1<0的圖像在SKIPIF1<0內(nèi)與SKIPIF1<0軸無交點,則SKIPIF1<0的取值范圍是__________.【變式1-2】(2023春·江西宜春·高三江西省宜豐中學(xué)??茧A段練習(xí))將函數(shù)SKIPIF1<0的圖象先向右平移SKIPIF1<0個單位長度,再把所得函數(shù)圖象的橫坐標變?yōu)樵瓉淼腟KIPIF1<0倍,縱坐標不變,得到函數(shù)SKIPIF1<0的圖象,若函數(shù)SKIPIF1<0在SKIPIF1<0上沒有零點,則SKIPIF1<0的取值范圍是(
)A.SKIPIF1<0 B.SKIPIF1<0 C.SKIPIF1<0 D.SKIPIF1<0【變式1-3】(2022·全國·高三專題練習(xí))將函數(shù)SKIPIF1<0的圖象先向右平移SKIPIF1<0個單位長度,再把所得函數(shù)圖象的橫坐標變?yōu)樵瓉淼腟KIPIF1<0倍,縱坐標不變,得到函數(shù)SKIPIF1<0的圖象,若函數(shù)SKIPIF1<0在SKIPIF1<0上沒有零點,則SKIPIF1<0的取值范圍是(
)A.SKIPIF1<0 B.SKIPIF1<0C.SKIPIF1<0 D.SKIPIF1<0題型10區(qū)間內(nèi)最值點型求w【解題攻略】極值點最大值最小值的問題,可以轉(zhuǎn)化為區(qū)間對稱軸的個數(shù),利用對稱軸公式求解?!镜淅?-1】.已知函數(shù)SKIPIF1<0(SKIPIF1<0,SKIPIF1<0),SKIPIF1<0,SKIPIF1<0,SKIPIF1<0在SKIPIF1<0內(nèi)有相鄰兩個最值點,且最小值點距離SKIPIF1<0軸近,則SKIPIF1<0的最小正整數(shù)值為(
)A.5 B.7 C.9 D.10【典例1-2】已知函數(shù)SKIPIF1<0的圖象關(guān)于點SKIPIF1<0及直線SKIPIF1<0對稱,且SKIPIF1<0在SKIPIF1<0不存在最值,則SKIPIF1<0的值為(
)A.SKIPIF1<0 B.SKIPIF1<0 C.SKIPIF1<0 D.SKIPIF1<0【變式1-1】(2022年全國高考乙卷數(shù)學(xué)(理)試題變式題13-16題)已知函數(shù)SKIPIF1<0,若SKIPIF1<0且SKIPIF1<0在區(qū)間SKIPIF1<0上有最小值無最大值,則SKIPIF1<0_______.【變式1-2】(2022屆湖南省長沙市第一中學(xué)高考模擬數(shù)學(xué)試題)已知函數(shù)SKIPIF1<0,SKIPIF1<0,若SKIPIF1<0,對任意SKIPIF1<0恒有SKIPIF1<0,在區(qū)間SKIPIF1<0上有且只有一個SKIPIF1<0使SKIPIF1<0,則SKIPIF1<0的最大值為()A.SKIPIF1<0 B.SKIPIF1<0 C.SKIPIF1<0 D.SKIPIF1<0【變式1-3】(【全國百強?!亢颖焙馑鹁?022屆高三12月第三次聯(lián)合質(zhì)量測評數(shù)學(xué)試題)已知函數(shù)SKIPIF1<0,兩個等式:SKIPIF1<0對任意的實數(shù)SKIPIF1<0均恒成立,且SKIPIF1<0上單調(diào),則SKIPIF1<0的最大值為A.1 B.2 C.3 D.4題型11多可能性分析型求w【解題攻略】解決函數(shù)SKIPIF1<0綜合性問題的注意點(1)結(jié)合條件確定參數(shù)SKIPIF1<0的值,進而得到函數(shù)的解析式.(2)解題時要將SKIPIF1<0看作一個整體,利用整體代換的方法,并結(jié)合正弦函數(shù)的相關(guān)性質(zhì)求解.(3)解題時要注意函數(shù)圖象的運用,使解題過程直觀形象化.【典例1-1】.函數(shù)SKIPIF1<0,已知SKIPIF1<0為SKIPIF1<0圖象的一個對稱中心,直線SKIPIF1<0為SKIPIF1<0圖象的一條對稱軸,且SKIPIF1<0在SKIPIF1<0上單調(diào)遞減.記滿足條件的所有SKIPIF1<0的值的和為SKIPIF1<0,則SKIPIF1<0的值為()A.SKIPIF1<0 B.SKIPIF1<0 C.SKIPIF1<0 D.SKIPIF1<0【典例1-2】(北京市西城區(qū)北京師范大學(xué)附屬實驗中學(xué)2021-2022學(xué)年高三上學(xué)期12月月考數(shù)學(xué)試題)已知點SKIPIF1<0,若三個點中有且僅有兩個點在函數(shù)SKIPIF1<0的圖象上,則正數(shù)SKIPIF1<0的最小值為__________.【變式1-1】(北京市東城區(qū)2021-2022學(xué)年高三上學(xué)期數(shù)學(xué)試題)已知函數(shù)SKIPIF1<0,曲線SKIPIF1<0與直線SKIPIF1<0相交,若存在相鄰兩個交點間的距離為SKIPIF1<0,則SKIPIF1<0的所有可能值為__________.【變式1-2】(上海市晉元高級中學(xué)2022屆高三數(shù)學(xué)試題)已知SKIPIF1<0,若存在SKIPIF1<0使得集合SKIPIF1<0中恰有3個元素,則SKIPIF1<0的取值不可能是()A.SKIPIF1<0 B.SKIPIF1<0 C.SKIPIF1<0 D.SKIPIF1<0【變式1-3】(2021?淮北二模)已知函數(shù)SKIPIF1<0滿足SKIPIF1<0,SKIPIF1<0,且SKIPIF1<0在區(qū)間SKIPIF1<0上單調(diào),則滿足條件的SKIPIF1<0個數(shù)為SKIPIF1<0SKIPIF1<0A.7 B.8 C.9 D.10題型12三角應(yīng)用:三角雙換元【解題攻略】形如SKIPIF1<0,SKIPIF1<0等,均可以用三角換元來解決.在利用三角換元時,一定要注意角度限制,因為對于三角函數(shù)的值域都是[-1,1],但其角度有多種形式,于是我們在設(shè)置角度時要抓住2點:設(shè)置的角度要使三角函數(shù)的范圍為[-1,1],(2)根號要能直接開出來.就如本題來講,令SKIPIF1<0,此時SKIPIF1<0,于是SKIPIF1<0.【典例1-1】(2023·全國·高三專題練習(xí))設(shè)SKIPIF1<0、SKIPIF1<0且SKIPIF1<0,求SKIPIF1<0的取值范圍是.【典例1-2】(2020·江西·校聯(lián)考模擬預(yù)測)若等差數(shù)列SKIPIF1<0滿足SKIPIF1<0,且SKIPIF1<0,求SKIPIF1<0的取值范圍(
)A.SKIPIF1<0 B.SKIPIF1<0 C.SKIPIF1<0 D.SKIPIF1<0【變式1-1】(2021·寧夏石嘴山·高三石嘴山市第三中學(xué)??茧A段練習(xí))已知SKIPIF1<0,SKIPIF1<0,求SKIPIF1<0的取值范圍為()A.SKIPIF1<0 B.SKIPIF1<0C.SKIPIF1<0 D.SKIPIF1<0【變式1-2】(江西省撫州市金溪一中等七校2021-2022學(xué)年高三考試數(shù)學(xué)試題(B卷))已知SKIPIF1<0滿足SKIPIF1<0,則SKIPIF1<0的取值范圍為A.SKIPIF1<0 B.SKIPIF1<0 C.SKIPIF1<0 D.SKIPIF1<0【變式1-3】(浙江省嘉興市2022屆高三試數(shù)學(xué)試題)已知實數(shù)SKIPIF1<0滿足SKIPIF1<0,則SKIPIF1<0的取值范圍是_______.題型13三角應(yīng)用:無理根號型【解題攻略】無理根號型求范圍,可以通過換元求得:1.單根號,一般是齊次關(guān)系。2.雙根號,不僅僅是齊次關(guān)系,并且平方后能消去x。3.式子可能具有“輪換特征”4.一定要注意取值范圍之間的變化與互相制約?!镜淅?-1】.求函數(shù)SKIPIF1<0的值域.【典例1-2】求函數(shù)SKIPIF1<0的值域.【變式1-1】若對任意SKIPIF1<0,SKIPIF1<0恒成立,則實數(shù)SKIPIF1<0的取值范圍是.【變式1-2】(新疆莎車縣第一中學(xué)2022屆高三上學(xué)期第三次質(zhì)量檢測數(shù)學(xué)試題)函數(shù)y=x?4?【變式1-3】(2020屆安徽省六安市第一中學(xué)高三下學(xué)期模擬卷(七)數(shù)學(xué)(理)試題)已知SKIPIF1<0,則SKIPIF1<0的最大值為_________.題型14三角應(yīng)用:圓代換型【解題攻略】圓代換型,利用圓的參數(shù)方程,注意盡量代換規(guī)范:余弦對應(yīng)x,正弦對應(yīng)ySKIPIF1<0的參數(shù)方程是:SKIPIF1<0【典例1-1】(上海市第二中學(xué)2020-2021學(xué)年高三下學(xué)期5月月考數(shù)學(xué)試題)知點A(2,0),點P是以原點SKIPIF1<0為圓心,1為半徑的圓上的任意一點,將點P繞點SKIPIF1<0逆時針旋轉(zhuǎn)90°得點Q,線段AP的中點為SKIPIF1<0,則|MQ|的最大值是______【典例1-2】設(shè)圓O:x2+y2=1上兩點Ax【變式1-1】已知SKIPIF1<0是單位圓(圓心在坐標原點SKIPIF1<0)上任一點,將射線SKIPIF1<0繞SKIPIF1<0點逆時針旋轉(zhuǎn)SKIPIF1<0到SKIPIF1<0交單位圓于點SKIPIF1<0,則SKIPIF1<0的最大值為________.【變式1-2】設(shè)圓SKIPIF1<0上兩點SKIPIF1<0,SKIPIF1<0滿足:SKIPIF1<0,則SKIPIF1<0的取值范圍是___________.【變式1-3】(2020·黑龍江哈爾濱·哈爾濱三中校考一模)已知點SKIPIF1<0為圓SKIPIF1<0上任一點,SKIPIF1<0,SKIPIF1<0分別為橢圓SKIPIF1<0的兩個焦點,求SKIPIF1<0的取值范圍.題型15三角應(yīng)用:向量型換元【解題攻略】向量中的三角換元原理之一,就是源于SKIPIF1<0,實質(zhì)是圓。所以模定值,可以用圓的參數(shù)方程代換。【典例1-1】(2022上·廣東佛山·高三統(tǒng)考)菱形SKIPIF1<0中,SKIPIF1<0,點E,F(xiàn)分別是線段SKIPIF1<0上的動點(包括端點),SKIPIF1<0,則SKIPIF1<0,SKIPIF1<0的最小值為.【典例1-2】(2020·江蘇南通·江蘇省如皋中學(xué)校考模擬預(yù)測)已知SKIPIF1<0,SKIPIF1<0,則向量SKIPIF1<0的最小值為.【變式1-1】(2024上·重慶·高三重慶南開中學(xué)??茧A段練習(xí))平面向量SKIPIF1<0,SKIPIF1<0,SKIPIF1<0滿足SKIPIF1<0,SKIPIF1<0,則SKIPIF1<0的最大值為.【變式1-2】(2023·全國·高三專題練習(xí))已知向量SKIPIF1<0,SKIPIF1<0滿足SKIPIF1<0,SKIPIF1<0,則SKIPIF1<0的最大值為.【變式1-3】(2023·上?!ど虾J衅邔氈袑W(xué)??寄M預(yù)測)已知SKIPIF1<0為單位向量,向量SKIPIF1<0滿足SKIPIF1<0,則SKIPIF1<0的取值范圍是.高考練場1.(2023·湖南長沙·長沙一中??寄M預(yù)測)設(shè)函數(shù)SKIPIF1<0SKIPIF1<0,將函數(shù)SKIPIF1<0的圖象先向右平移SKIPIF1<0個單位長度,再將橫坐標伸長到原來的2倍,縱坐標不變,所得的圖象與SKIPIF1<0圖象重合,則(
)A.SKIPIF1<0,SKIPIF1<0 B.SKIPIF1<0,SKIPIF1<0C.SKIPIF1<0,SKIPIF1<0 D.SKIPIF1<0,SKIPIF1<02.(湖南省長沙市長郡中學(xué)2020-2021學(xué)年高三上學(xué)期月考(二)數(shù)學(xué)試題)已知函數(shù)SKIPIF1<0,其中SKIPIF1<0,若SKIPIF1<0在區(qū)間SKIPIF1<0上單調(diào)遞減,則SKIPIF1<0的最大值為__________.3.(2022·四川綿陽·統(tǒng)考模擬預(yù)測)若存在實數(shù)SKIPIF1<0,使得函數(shù)SKIPIF1<0(SKIPIF1<0>0)的圖象的一個對稱中心為(SKIPIF1<0,0),則ω的取值范圍為(
)A.SKIPIF1<0 B.SKIPIF1<0C.SKIPIF1<0 D.SKIPIF1<04.(2023·安徽滁州·安徽省定遠中學(xué)??家荒#┮阎本€SKIPIF1<0是函數(shù)SKIPIF1<0(SKIPIF1<0)圖象的一條對稱軸,則SKIPIF1<0在SKIPIF1<0上的值域為(
)A.SKIPIF1<0 B.SKIPIF1<0 C.SKIPIF1<0 D.SKIPIF1<05.(2020屆百校聯(lián)考高考百日沖刺金卷全國Ⅱ卷?數(shù)學(xué)(理)(二)試題)已知函數(shù)SKIPIF1<0的一條對稱軸為SKIPIF1<0,且SKIPIF1<0在SKIPIF1<0上單調(diào),則SKIPIF1<0的最大
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