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第03講兩角和與差的正弦、余弦和正切公式(精講+精練)目錄第一部分:知識點(diǎn)精準(zhǔn)記憶第二部分:課前自我評估測試第三部分:典型例題剖析高頻考點(diǎn)一:公式的基本應(yīng)用高頻考點(diǎn)二:公式的逆用及變形高頻考點(diǎn)三:輔助角公式的運(yùn)用高頻考點(diǎn)四:二倍角高頻考點(diǎn)五:拼湊角第四部分:高考真題感悟第五部分:第03講兩角和與差的正弦、余弦和正切公式(精練)第一部分:知識點(diǎn)精準(zhǔn)記憶第一部分:知識點(diǎn)精準(zhǔn)記憶1、兩角和與差的正弦、余弦和正切公式①兩角和與差的正弦公式SKIPIF1<0SKIPIF1<0②兩角和與差的余弦公式SKIPIF1<0SKIPIF1<0③兩角和與差的正切公式SKIPIF1<0SKIPIF1<02、二倍角公式①SKIPIF1<0②SKIPIF1<0;SKIPIF1<0;SKIPIF1<0③SKIPIF1<03、降冪公式SKIPIF1<0SKIPIF1<04、輔助角公式:SKIPIF1<0(其中SKIPIF1<0)5、常用結(jié)論①兩角和與差的正切公式的變形:SKIPIF1<0②SKIPIF1<0③SKIPIF1<0④SKIPIF1<0第二部分:課前自我評估測試第二部分:課前自我評估測試一、判斷題1.(2021·江西·貴溪市實(shí)驗(yàn)中學(xué)高三階段練習(xí))SKIPIF1<0.()【答案】正確【詳解】由SKIPIF1<0,可得SKIPIF1<0,所以SKIPIF1<0SKIPIF1<0.故答案為:正確.2.(2021·江西·貴溪市實(shí)驗(yàn)中學(xué)高三階段練習(xí))SKIPIF1<0.()【答案】錯誤【詳解】由題意,SKIPIF1<0故答案為:錯誤二、單選題3.(2022·北京·高三學(xué)業(yè)考試)SKIPIF1<0(

)A.SKIPIF1<0 B.SKIPIF1<0 C.SKIPIF1<0 D.SKIPIF1<0【答案】A【詳解】由二倍角公式可得,SKIPIF1<0SKIPIF1<0.故選:A.4.(2022·四川成都·高一期中(理))SKIPIF1<0(

)A.SKIPIF1<0 B.SKIPIF1<0 C.SKIPIF1<0 D.SKIPIF1<0【答案】B【詳解】SKIPIF1<0SKIPIF1<0SKIPIF1<0SKIPIF1<0SKIPIF1<0SKIPIF1<0;故選:B.三、填空題5.(2022·云南玉溪·高一期末)SKIPIF1<0的值等于____________.【答案】2【詳解】SKIPIF1<0.故答案為:SKIPIF1<06.(2022·上海市青浦高級中學(xué)高一階段練習(xí))將SKIPIF1<0化為SKIPIF1<0的形式為______.【答案】SKIPIF1<0【詳解】SKIPIF1<0SKIPIF1<0SKIPIF1<0故答案為:SKIPIF1<0第三部分:典型例題剖析第三部分:典型例題剖析高頻考點(diǎn)一:公式的基本應(yīng)用例題1.(2022·江蘇徐州·高一期中)已知SKIPIF1<0,若SKIPIF1<0,則SKIPIF1<0(

)A.SKIPIF1<0 B.SKIPIF1<0C.SKIPIF1<0 D.SKIPIF1<0【答案】A【詳解】因?yàn)镾KIPIF1<0,SKIPIF1<0,所以SKIPIF1<0SKIPIF1<0SKIPIF1<0SKIPIF1<0.故選:A例題2.(2022·四川成都·高一期中(理))若SKIPIF1<0,SKIPIF1<0是方程SKIPIF1<0兩個(gè)實(shí)數(shù)根,則SKIPIF1<0(

)A.SKIPIF1<0 B.SKIPIF1<0 C.SKIPIF1<0 D.SKIPIF1<0【答案】A【詳解】由韋達(dá)定理得:SKIPIF1<0,SKIPIF1<0,所以SKIPIF1<0故選:A例題3.(2022·浙江金華第一中學(xué)高一階段練習(xí))已知SKIPIF1<0,SKIPIF1<0,則SKIPIF1<0A.SKIPIF1<0 B.SKIPIF1<0 C.SKIPIF1<0 D.SKIPIF1<0【答案】A【詳解】由SKIPIF1<0得SKIPIF1<0,由SKIPIF1<0得SKIPIF1<0,兩式相加得SKIPIF1<0,得SKIPIF1<0.故選:A例題4.(2022·江蘇·淮陰中學(xué)高一階段練習(xí))求值SKIPIF1<0(

)A.SKIPIF1<0 B.SKIPIF1<0 C.SKIPIF1<0 D.SKIPIF1<0【答案】A【詳解】SKIPIF1<0,SKIPIF1<0;故選:A.例題5.(2022·陜西·榆林市第一中學(xué)高一期中(文))化簡計(jì)算:SKIPIF1<0___________.【答案】SKIPIF1<0【詳解】解:SKIPIF1<0,SKIPIF1<0,SKIPIF1<0,故答案為:SKIPIF1<0例題6.(2022·北京·北師大實(shí)驗(yàn)中學(xué)高一期中)若SKIPIF1<0,則SKIPIF1<0___________;SKIPIF1<0___________.【答案】

SKIPIF1<0

SKIPIF1<0【詳解】SKIPIF1<0,SKIPIF1<0.故答案為:SKIPIF1<0;SKIPIF1<0.題型歸類練1.(2022·河北·滄縣中學(xué)高一階段練習(xí))SKIPIF1<0(

)A.SKIPIF1<0 B.SKIPIF1<0 C.-SKIPIF1<0 D.-SKIPIF1<0【答案】A【詳解】SKIPIF1<0.故選:A2.(2022·北京市第二十五中學(xué)高一期中)SKIPIF1<0(

)A.SKIPIF1<0 B.SKIPIF1<0C.SKIPIF1<0 D.SKIPIF1<0【答案】C【詳解】SKIPIF1<0故選:C3.(2022·北京·北師大實(shí)驗(yàn)中學(xué)高一期中)已知SKIPIF1<0,SKIPIF1<0,則SKIPIF1<0(

)A.SKIPIF1<0 B.SKIPIF1<0 C.SKIPIF1<0 D.SKIPIF1<0【答案】C【詳解】由SKIPIF1<0,SKIPIF1<0,可得SKIPIF1<0則SKIPIF1<0故選:C4.(2022·江蘇·南京外國語學(xué)校高一期中)已知SKIPIF1<0,SKIPIF1<0,則SKIPIF1<0的值為(

)A.SKIPIF1<0 B.SKIPIF1<0 C.SKIPIF1<0 D.SKIPIF1<0【答案】C【詳解】因?yàn)镾KIPIF1<0,SKIPIF1<0,所以SKIPIF1<0,所以SKIPIF1<0,故選:C5.(2022·湖南·寧鄉(xiāng)市教育研究中心模擬預(yù)測)若SKIPIF1<0,則SKIPIF1<0=(

)A.SKIPIF1<0 B.SKIPIF1<0C.SKIPIF1<0 D.SKIPIF1<0【答案】D【詳解】解:因?yàn)镾KIPIF1<0,SKIPIF1<0,所以SKIPIF1<0,所以SKIPIF1<0=SKIPIF1<0.故選:D.6.(2022·山東德州·高一期中)已知SKIPIF1<0,則SKIPIF1<0______.【詳解】由SKIPIF1<0得,SKIPIF1<0,即SKIPIF1<0,所以SKIPIF1<0,即SKIPIF1<0,故SKIPIF1<0,故答案為:07.(2022·江蘇·南京師大附中高一期中)設(shè)復(fù)數(shù)SKIPIF1<0,SKIPIF1<0,已知SKIPIF1<0.(1)求SKIPIF1<0的值;(2)若SKIPIF1<0,求SKIPIF1<0的值.【答案】(1)SKIPIF1<0(2)SKIPIF1<0(1)根據(jù)題意,SKIPIF1<0,因?yàn)镾KIPIF1<0,所以SKIPIF1<0,即SKIPIF1<0,即SKIPIF1<0,解得SKIPIF1<0.(2)因?yàn)镾KIPIF1<0,所以SKIPIF1<0,所以SKIPIF1<0,SKIPIF1<0SKIPIF1<0因?yàn)镾KIPIF1<0,所以SKIPIF1<0,所以SKIPIF1<0.高頻考點(diǎn)二:公式的逆用及變形例題1.(2022·江蘇省前黃高級中學(xué)高一階段練習(xí))SKIPIF1<0(

)A.SKIPIF1<0 B.SKIPIF1<0 C.SKIPIF1<0 D.SKIPIF1<0【答案】C【詳解】SKIPIF1<0SKIPIF1<0SKIPIF1<0,由兩角和的正弦公式,可知SKIPIF1<0故答案為:C例題2.(2022·江蘇·華羅庚中學(xué)高三階段練習(xí))已知SKIPIF1<0,SKIPIF1<0,SKIPIF1<0均為銳角,則SKIPIF1<0(

)A.SKIPIF1<0 B.SKIPIF1<0 C.SKIPIF1<0 D.SKIPIF1<0【答案】C【詳解】SKIPIF1<0均為銳角,即SKIPIF1<0,SKIPIF1<0,SKIPIF1<0,又SKIPIF1<0,SKIPIF1<0SKIPIF1<0,又SKIPIF1<0,SKIPIF1<0.故選:C.例題3.(2022·陜西·榆林市第一中學(xué)高一期中(文))SKIPIF1<0___________.【答案】12##0.5【詳解】SKIPIF1<0.故答案為:SKIPIF1<0例題4.(2022·四川涼山·高一期中(理))SKIPIF1<0_________.【答案】SKIPIF1<0【詳解】解:由題意得:由兩角和的正切公式SKIPIF1<0,可令SKIPIF1<0SKIPIF1<0,可得SKIPIF1<0故答案為:SKIPIF1<0例題5.(2022·江蘇·鹽城市伍佑中學(xué)高一期中)求下列各式的值.(1)SKIPIF1<0(2)SKIPIF1<0【答案】(1)SKIPIF1<0(2)SKIPIF1<0(1)解SKIPIF1<0(2)解:SKIPIF1<0SKIPIF1<0.題型歸類練1.(2022·河南·寶豐縣第一高級中學(xué)模擬預(yù)測(理))SKIPIF1<0(

)A.SKIPIF1<0 B.1 C.SKIPIF1<0 D.SKIPIF1<0【答案】C【詳解】由三角函數(shù)的基本關(guān)系式和三角恒等變換的公式,可得:SKIPIF1<0SKIPIF1<0.故選:C.2.(2022·四川省廣安第三中學(xué)校高一階段練習(xí))SKIPIF1<0等于(

)A.SKIPIF1<0 B.SKIPIF1<0 C.SKIPIF1<01 D.1【答案】D【詳解】SKIPIF1<0SKIPIF1<0SKIPIF1<0SKIPIF1<0,故選:D3.(2022·上?!とA東師范大學(xué)附屬天山學(xué)校高一期中)已知SKIPIF1<0,則SKIPIF1<0____________.【答案】SKIPIF1<0【詳解】SKIPIF1<0,所以SKIPIF1<0,SKIPIF1<0.故答案為:SKIPIF1<0.4.(2022·江蘇·蘇州市蘇州高新區(qū)第一中學(xué)高一期中)化簡:SKIPIF1<0__________.【答案】SKIPIF1<0##SKIPIF1<0【詳解】因?yàn)镾KIPIF1<0,故SKIPIF1<0,所以SKIPIF1<0SKIPIF1<0故答案為:SKIPIF1<05.(2022·江蘇宿遷·高一期中)在SKIPIF1<0中,已知SKIPIF1<0,則SKIPIF1<0_________【答案】SKIPIF1<0【詳解】由題意可知,SKIPIF1<0所以,SKIPIF1<0SKIPIF1<0SKIPIF1<0,SKIPIF1<0故SKIPIF1<0故答案為:SKIPIF1<06.(2022·江蘇·馬壩高中高一期中)SKIPIF1<0__________.【答案】SKIPIF1<0【詳解】因?yàn)镾KIPIF1<0,所以,SKIPIF1<0.故答案為:SKIPIF1<0.高頻考點(diǎn)三:輔助角公式的運(yùn)用例題1.(2022·全國·高一課時(shí)練習(xí))求下列函數(shù)的最大值和最小值:(1)SKIPIF1<0;(2)SKIPIF1<0;(3)SKIPIF1<0;(4)SKIPIF1<0.【答案】(1)最大值為1,最小值為SKIPIF1<0(2)最大值為SKIPIF1<0,最小值為SKIPIF1<0(3)最大值為2,最小值為SKIPIF1<0(4)最大值為2,最小值為SKIPIF1<0【解析】(1)SKIPIF1<0,SKIPIF1<0最大值為1,最小值為SKIPIF1<0;(2)SKIPIF1<0,SKIPIF1<0最大值為SKIPIF1<0,最小值為SKIPIF1<0;(3)SKIPIF1<0,SKIPIF1<0最大值為2,最小值為SKIPIF1<0;(4)SKIPIF1<0,SKIPIF1<0最大值為2,最小值為SKIPIF1<0.例題2.(2021·全國·高一課時(shí)練習(xí))設(shè)m為實(shí)數(shù),已知SKIPIF1<0,求m的取值范圍.【答案】SKIPIF1<0【詳解】解:因?yàn)镾KIPIF1<0,因?yàn)镾KIPIF1<0,所以SKIPIF1<0,即SKIPIF1<0,所以SKIPIF1<0例題3.(2022·黑龍江·勃利縣高級中學(xué)高一階段練習(xí))求函數(shù)SKIPIF1<0的值域.【答案】SKIPIF1<0【詳解】令SKIPIF1<0,則SKIPIF1<0,故SKIPIF1<0與SKIPIF1<0值域相同,又SKIPIF1<0對稱軸SKIPIF1<0,故其在SKIPIF1<0單調(diào)遞減,在SKIPIF1<0單調(diào)遞增,當(dāng)SKIPIF1<0時(shí),SKIPIF1<0;當(dāng)SKIPIF1<0時(shí),SKIPIF1<0,故其值域?yàn)镾KIPIF1<0,即SKIPIF1<0的值域?yàn)镾KIPIF1<0.題型歸類練1.(2022·江西九江·三模(文))已知SKIPIF1<0,則SKIPIF1<0(

)A.SKIPIF1<0 B.SKIPIF1<0 C.SKIPIF1<0 D.SKIPIF1<0【答案】B【詳解】SKIPIF1<0,即SKIPIF1<0,SKIPIF1<0故選:B2.(2022·江西·南昌市實(shí)驗(yàn)中學(xué)一模(文))SKIPIF1<0(

)A.SKIPIF1<0 B.SKIPIF1<0 C.SKIPIF1<0 D.SKIPIF1<0【答案】A【詳解】原式SKIPIF1<0SKIPIF1<0.故選:A3.(2022·湖南·模擬預(yù)測)SKIPIF1<0___________.【答案】4【詳解】SKIPIF1<0故答案為:44.(2022·陜西漢中·高一期中)(1)若SKIPIF1<0,求SKIPIF1<0的值;(2)若SKIPIF1<0,求SKIPIF1<0的值.【答案】(1)SKIPIF1<0;(2)SKIPIF1<0.(1)SKIPIF1<0,SKIPIF1<0,SKIPIF1<0,SKIPIF1<0.(2)SKIPIF1<0,SKIPIF1<0.5.(2021·全國·高一課時(shí)練習(xí))求下列函數(shù)的最大值和最小值:(1)SKIPIF1<0;(2)SKIPIF1<0(a,b均為正數(shù)).【答案】(1)最大值為1,最小值為-1.(2)最大值為SKIPIF1<0,最小值為SKIPIF1<0.(1)SKIPIF1<0,SKIPIF1<0,∴函數(shù)的最大值為1,最小值為-1.(2)SKIPIF1<0,SKIPIF1<0,∴函數(shù)的最大值為SKIPIF1<0,最小值為SKIPIF1<0.高頻考點(diǎn)四:二倍角例題1.(2022·北京·匯文中學(xué)高一期中)若SKIPIF1<0,則SKIPIF1<0(

)A.SKIPIF1<0 B.SKIPIF1<0 C.SKIPIF1<0 D.SKIPIF1<0【答案】B【詳解】SKIPIF1<0兩邊平方得:SKIPIF1<0,解得:SKIPIF1<0故選:B例題2.(2022·甘肅·永昌縣第一高級中學(xué)高二期中(文))已知SKIPIF1<0,則SKIPIF1<0等于(

)A.SKIPIF1<0 B.SKIPIF1<0 C.SKIPIF1<0 D.SKIPIF1<0【答案】D【詳解】由SKIPIF1<0得SKIPIF1<0,SKIPIF1<0SKIPIF1<0.故選:D.例題3.(2022·全國·高三階段練習(xí)(理))已知SKIPIF1<0,則SKIPIF1<0(

)A.SKIPIF1<0 B.SKIPIF1<0 C.SKIPIF1<0 D.SKIPIF1<0【答案】B【詳解】SKIPIF1<0,SKIPIF1<0,解得:SKIPIF1<0(舍)或SKIPIF1<0,SKIPIF1<0.故選:B.例題4.(2022·云南曲靖·二模(文))已知SKIPIF1<0,則SKIPIF1<0___________.【答案】SKIPIF1<0【詳解】SKIPIF1<0,SKIPIF1<0,SKIPIF1<0.故答案為:SKIPIF1<0例題5.(2022·北京·中關(guān)村中學(xué)高一期中)若角SKIPIF1<0的終邊經(jīng)過點(diǎn)SKIPIF1<0,則SKIPIF1<0___________.SKIPIF1<0___________.【答案】

SKIPIF1<0

SKIPIF1<0【詳解】∵角SKIPIF1<0的終邊經(jīng)過點(diǎn)SKIPIF1<0,∴SKIPIF1<0,∴SKIPIF1<0SKIPIF1<0故答案為:SKIPIF1<0,SKIPIF1<0.題型歸類練1.(2022·江西鷹潭·二模(文))已知SKIPIF1<0,且SKIPIF1<0,則SKIPIF1<0(

)A.SKIPIF1<0 B.SKIPIF1<0 C.SKIPIF1<0 D.SKIPIF1<0或SKIPIF1<0【答案】C【詳解】解:SKIPIF1<0,SKIPIF1<0,SKIPIF1<0,即SKIPIF1<0,解得SKIPIF1<0或SKIPIF1<0,因?yàn)镾KIPIF1<0,所以SKIPIF1<0,所以SKIPIF1<0,SKIPIF1<0,SKIPIF1<0.故選:C2.(2022·陜西·長安一中模擬預(yù)測(理))已知函數(shù)SKIPIF1<0,則SKIPIF1<0的最小值為(

)A.SKIPIF1<0 B.SKIPIF1<0 C.SKIPIF1<0 D.SKIPIF1<0【答案】C【詳解】解:因?yàn)镾KIPIF1<0所以當(dāng)SKIPIF1<0時(shí)SKIPIF1<0取得最小值SKIPIF1<0;故選:C3.(2022·云南德宏·高三期末(文))已知SKIPIF1<0,則SKIPIF1<0=(

)A.SKIPIF1<0 B.SKIPIF1<0 C.SKIPIF1<0 D.SKIPIF1<0【答案】A【詳解】SKIPIF1<0,所以SKIPIF1<0,SKIPIF1<0,SKIPIF1<0.故選:A.4.(2022·四川省廣漢中學(xué)高一階段練習(xí)(理))若SKIPIF1<0,則SKIPIF1<0(

)A.SKIPIF1<0 B.SKIPIF1<0 C.SKIPIF1<0 D.SKIPIF1<0【答案】D【詳解】解:因?yàn)镾KIPIF1<0,所以SKIPIF1<0,所以SKIPIF1<0,解得SKIPIF1<0,所以SKIPIF1<0;故選:D5.(2022·江蘇南通·高一階段練習(xí))已知SKIPIF1<0,則SKIPIF1<0(

)A.SKIPIF1<0 B.SKIPIF1<0 C.SKIPIF1<0 D.SKIPIF1<0【答案】B【詳解】由SKIPIF1<0,可得SKIPIF1<0則SKIPIF1<0故選:B6.(2022·陜西·長安一中高一期中)已知SKIPIF1<0,且SKIPIF1<0,則SKIPIF1<0________.【答案】SKIPIF1<0【詳解】∵SKIPIF1<0,∴SKIPIF1<0,因?yàn)镾KIPIF1<0,所以SKIPIF1<0,則SKIPIF1<0,所以SKIPIF1<0.故答案為:SKIPIF1<0.7.(2022·北京市西城外國語學(xué)校高一期中)已知角SKIPIF1<0的終邊在直線SKIPIF1<0上,則SKIPIF1<0________.【答案】SKIPIF1<0【詳解】由題意,設(shè)角SKIPIF1<0的終邊與直線SKIPIF1<0交于點(diǎn)SKIPIF1<0,由三角函數(shù)的定義可知SKIPIF1<0.于是,SKIPIF1<0.故答案為:SKIPIF1<0.8.(2022·遼寧沈陽·高一期中)若SKIPIF1<0,則SKIPIF1<0___________.【答案】SKIPIF1<0【詳解】解:因?yàn)镾KIPIF1<0①,所以兩邊同時(shí)平方得SKIPIF1<0,即SKIPIF1<0,因?yàn)镾KIPIF1<0,所以SKIPIF1<0,所以SKIPIF1<0,所以SKIPIF1<0②,聯(lián)立①②可得SKIPIF1<0,所以SKIPIF1<0,故答案為:SKIPIF1<0.9.(2022·浙江紹興·模擬預(yù)測)已知SKIPIF1<0,則SKIPIF1<0________,SKIPIF1<0__________.【答案】

SKIPIF1<0

1【詳解】SKIPIF1<0SKIPIF1<0故答案為:SKIPIF1<0,1.高頻考點(diǎn)五:拼湊角例題1.(2022·江蘇·東??h教育局教研室高一期中)已知SKIPIF1<0,SKIPIF1<0,SKIPIF1<0,SKIPIF1<0,則SKIPIF1<0的值為(

)A.SKIPIF1<0 B.SKIPIF1<0 C.SKIPIF1<0 D.SKIPIF1<0【答案】A【詳解】由SKIPIF1<0,SKIPIF1<0可得SKIPIF1<0,故SKIPIF1<0,SKIPIF1<0,故SKIPIF1<0SKIPIF1<0.故選:A.例題2.(2022·江蘇·蘇州市蘇州高新區(qū)第一中學(xué)高一期中)設(shè)SKIPIF1<0,且SKIPIF1<0,則SKIPIF1<0(

)A.SKIPIF1<0 B.SKIPIF1<0 C.SKIPIF1<0 D.SKIPIF1<0【答案】A【詳解】因?yàn)镾KIPIF1<0,所以SKIPIF1<0,且SKIPIF1<0,所以SKIPIF1<0,則SKIPIF1<0故選:A.例題3.(2022·江蘇·星海實(shí)驗(yàn)中學(xué)高一期中)已知SKIPIF1<0,且SKIPIF1<0,則SKIPIF1<0的值為(

)A.SKIPIF1<0 B.SKIPIF1<0 C.SKIPIF1<0 D.SKIPIF1<0【答案】D【詳解】SKIPIF1<0,SKIPIF1<0,SKIPIF1<0,SKIPIF1<0SKIPIF1<0.故選:D例題4.(2022·江蘇·漣水縣第一中學(xué)高一階段練習(xí))已知SKIPIF1<0都是銳角,SKIPIF1<0,SKIPIF1<0,則SKIPIF1<0(

)A.1 B.SKIPIF1<0 C.SKIPIF1<0 D.SKIPIF1<0【答案】C【詳解】因?yàn)镾KIPIF1<0都是銳角,所以SKIPIF1<0,又SKIPIF1<0,SKIPIF1<0,所以SKIPIF1<0,SKIPIF1<0,所以SKIPIF1<0,SKIPIF1<0,SKIPIF1<0,故選;C題型歸類練1.(2022·北京市第五十中學(xué)高一期中)若SKIPIF1<0都是銳角,且SKIPIF1<0,SKIPIF1<0,則SKIPIF1<0(

)A.SKIPIF1<0 B.SKIPIF1<0 C.SKIPIF1<0 D.SKIPIF1<0【答案】B【詳解】SKIPIF1<0都是銳角,SKIPIF1<0,SKIPIF1<0,SKIPIF1<0,SKIPIF1<0,SKIPIF1<0SKIPIF1<0.故選:B.2.(2022·安徽淮南·二模(理))已知SKIPIF1<0,則SKIPIF1<0(

)A.SKIPIF1<0 B.SKIPIF1<0 C.SKIPIF1<0或SKIPIF1<0 D.0或SKIPIF1<0【答案】A【詳解】因?yàn)镾KIPIF1<0,所以SKIPIF1<0,因?yàn)镾KIPIF1<0,所以SKIPIF1<0,因?yàn)镾KIPIF1<0,所以SKIPIF1<0當(dāng)SKIPIF1<0時(shí),SKIPIF1<0SKIPIF1<0,因?yàn)镾KIPIF1<0,所以SKIPIF1<0,故SKIPIF1<0滿足題意,當(dāng)SKIPIF1<0時(shí),SKIPIF1<0SKIPIF1<0因?yàn)镾KIPIF1<0,故SKIPIF1<0不合題意,舍去;故選:A3.(2022·甘肅省民樂縣第一中學(xué)高一期中)若SKIPIF1<0,SKIPIF1<0,則SKIPIF1<0(

)A.SKIPIF1<0 B.SKIPIF1<0 C.SKIPIF1<0 D.SKIPIF1<0【答案】A【詳解】SKIPIF1<0.故選:A.4.(2022·四川成都·高一期中(理))已知SKIPIF1<0、SKIPIF1<0為銳角,且SKIPIF1<0,SKIPIF1<0,則SKIPIF1<0的值為(

)A.SKIPIF1<0 B.SKIPIF1<0 C.SKIPIF1<0 D.SKIPIF1<0【答案】A【詳解】因?yàn)镾KIPIF1<0、SKIPIF1<0為銳角,所以SKIPIF1<0,因?yàn)镾KIPIF1<0,所以SKIPIF1<0,因?yàn)镾KIPIF1<0,所以SKIPIF1<0,故SKIPIF1<0SKIPIF1<0故選:A4.(2022·江蘇省鎮(zhèn)江中學(xué)高一期中)已知SKIPIF1<0為銳角,SKIPIF1<0,則SKIPIF1<0(

)A.SKIPIF1<0 B.SKIPIF1<0 C.3 D.SKIPIF1<0【答案】A【詳解】由題設(shè)可得SKIPIF1<0,故選:A.第四部分:高考真題感悟第四部分:高考真題感悟1.(2021·全國·高考真題(文))函數(shù)SKIPIF1<0的最小正周期和最大值分別是(

)A.SKIPIF1<0和SKIPIF1<0 B.SKIPIF1<0和2 C.SKIPIF1<0和SKIPIF1<0 D.SKIPIF1<0和2【答案】C【詳解】由題,SKIPIF1<0,所以SKIPIF1<0的最小正周期為SKIPIF1<0,最大值為SKIPIF1<0.故選:C.2.(2020·全國·高考真題(理))已知2tanθ–tan(θ+SKIPIF1<0)=7,則tanθ=(

)A.–2 B.–1 C.1 D.2【答案】D【詳解】SKIPIF1<0,SKIPIF1<0,令SKIPIF1<0,則SKIPIF1<0,整理得SKIPIF1<0,解得SKIPIF1<0,即SKIPIF1<0.故選:D.3.(2020·全國·高考真題(文))已知SKIPIF1<0,則SKIPIF1<0(

)A.SKIPIF1<0 B.SKIPIF1<0 C.SKIPIF1<0 D.SKIPIF1<0【答案】B【詳解】由題意可得:SKIPIF1<0,則:SKIPIF1<0,SKIPIF1<0,從而有:SKIPIF1<0,即SKIPIF1<0.故選:B.4.(2020·全國·高考真題(文))若SKIPIF1<0,則SKIPIF1<0__________.【答案】SKIPIF1<0【詳解】SKIPIF1<0.故答案為:SKIPIF1<0.5.(2020·江蘇·高考真題)已知SKIPIF1<0=SKIPIF1<0,則SKIPIF1<0的值是____.【答案】SKIPIF1<0【詳解】SKIPIF1<0SKIPIF1<0故答案為:SKIPIF1<06.(2020·浙江·高考真題)已知SKIPIF1<0,則SKIPIF1<0________;SKIPIF1<0______.【答案】

SKIPIF1<0

SKIPIF1<0【詳解】SKIPIF1<0,SKIPIF1<0,故答案為:SKIPIF1<07.(2021·浙江·高考真題)設(shè)函數(shù)SKIPIF1<0.(1)求函數(shù)SKIPIF1<0的最小正周期;(2)求函數(shù)SKIPIF1<0在SKIPIF1<0上的最大值.【答案】(1)SKIPIF1<0;(2)SKIPIF1<0.【詳解】(1)由輔助角公式得SKIPIF1<0,則SKIPIF1<0,所以該函數(shù)的最小正周期SKIPIF1<0;(2)由題意,SKIPIF1<0SKIPIF1<0SKIPIF1<0,由SKIPIF1<0可得SKIPIF1<0,所以當(dāng)SKIPIF1<0即SKIPIF1<0時(shí),函數(shù)取最大值SKIPIF1<0.第五部分:第03講兩角和與差的正弦、余弦和正切公式(精練)第五部分:第03講兩角和與差的正弦、余弦和正切公式(精練)一、單選題1.(2022·四川省南充市白塔中學(xué)高一期中(文))SKIPIF1<0的值是(

)A.SKIPIF1<0 B.SKIPIF1<0 C.SKIPIF1<0 D.SKIPIF1<0【答案】C【詳解】SKIPIF1<0.故選:C2.(2022·江蘇淮安·高一期中)已知SKIPIF1<0,SKIPIF1<0,則SKIPIF1<0(

)A.SKIPIF1<0 B.-SKIPIF1<0 C.-SKIPIF1<0 D.SKIPIF1<0【答案】B【詳解】因?yàn)镾KIPIF1<0,SKIPIF1<0,所以SKIPIF1<0.故選:B.3.(2022·四川涼山·高一期中(理))已知SKIPIF1<0,則SKIPIF1<0的值為(

)A.SKIPIF1<0 B.SKIPIF1<0 C.SKIPIF1<0 D.SKIPIF1<0【答案】C【詳解】解:由題意得:SKIPIF1<0SKIPIF1<0,解得:SKIPIF1<0SKIPIF1<0故選:C4.(2022·湖南·岳陽市教育科學(xué)技術(shù)研究院三模)SKIPIF1<0(

)A.SKIPIF1<0 B.SKIPIF1<0 C.SKIPIF1<0 D.SKIPIF1<0【答案】D【詳解】由余弦的倍角公式,可得SKIPIF1<0.故選:D.5.(2022·四川涼山·高一期中(理))求SKIPIF1<0的值為(

)A.SKIPIF1<0 B.SKIPIF1<0 C.SKIPIF1<0 D.SKIPIF1<0【答案】D【詳解】SKIPIF1<0.故選:D.6.(2022·江蘇·南京市金陵中學(xué)河西分校高一期中)已知SKIPIF1<0,則SKIPIF1<0(

)A.SKIPIF1<0 B.SKIPIF1<0 C.SKIPIF1<0 D.SKIPIF1<0【答案】B【詳解】由SKIPIF1<0兩邊平方得:SKIPIF1<0,所以SKIPIF1<0即SKIPIF1<0,所以SKIPIF1<0.故選:B.7.(2022·廣東茂名·模擬預(yù)測)已知SKIPIF1<0,則SKIPIF1<0(

)A.SKIPIF1<0 B.SKIPIF1<0 C.SKIPIF1<0 D.SKIPIF1<0【答案】B【詳解】SKIPIF1<0SKIPIF1<0,SKIPIF1<0,∴SKIPIF1<0.故選:B.8.(2022·江蘇南通·模擬預(yù)測)在△ABC中,若SKIPIF1<0,則SKIPIF1<0(

)A.SKIPIF1<0 B.SKIPIF1<0 C.SKIPIF1<0 D.SKIPIF1<0【答案】A【詳解】因?yàn)镾KIPIF1<0,所以SKIPIF1<0,所以SKIPIF1<0,SKIPIF1<0,故選:A.二、填空題9.(2022·上海市仙霞高級中學(xué)高一期中)函數(shù)SKIPIF1<0的最大值是______.【答案】SKIPIF1<0【詳解】解:SKIPIF1<0,其中SKIPIF1<0,SKIPIF1<0;因?yàn)镾KIPIF1<0,所以SKIPIF1<0;故答案為:SKIPIF1<010.(2022·北京市育英中學(xué)高一期中)已知SKIPIF1<0,SKIPIF1<0,則SKIPIF1<0的值為__________.【

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