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2025届高中数学一轮复习练习:第五章限时跟踪检测(二十三) 同角三角函数基本关系式及诱导公式(含解析)_2.2025数学总复习_2025年新高考资料_一轮复习

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2025届高中数学一轮复习练习:第五章限时跟踪检测(二十三) 同角三角函数基本关系式及诱导公式(含解析)_2.2025数学总复习_2025年新高考资料_一轮复习
2025届高中数学一轮复习练习:第五章限时跟踪检测(二十三) 同角三角函数基本关系式及诱导公式(含解析)_2.2025数学总复习_2025年新高考资料_一轮复习
2025届高中数学一轮复习练习:第五章限时跟踪检测(二十三) 同角三角函数基本关系式及诱导公式(含解析)_2.2025数学总复习_2025年新高考资料_一轮复习
2025届高中数学一轮复习练习:第五章限时跟踪检测(二十三) 同角三角函数基本关系式及诱导公式(含解析)_2.2025数学总复习_2025年新高考资料_一轮复习
2025届高中数学一轮复习练习:第五章限时跟踪检测(二十三) 同角三角函数基本关系式及诱导公式(含解析)_2.2025数学总复习_2025年新高考资料_一轮复习

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限时跟踪检测(二十三) 同角三角函数基本关系式及诱导公式 一、单项选择题 1.下列各数中与sin 2 024°的值最接近的是( ) A. B. C.- D.- 2.已知α为锐角,且2tan(π-α)-3cos+5=0,tan(π+α)+6sin(π+β)-1=0,则sin α =( ) A. B. C. D. 3.在△ABC中,sin A·cos A=-,则cos A-sin A=( ) A.- B.- C. D.± 4.化简的结果是( ) A.sin 3-cos 3 B.cos 3-sin 3 C.±(sin 3-cos 3) D.以上都不对 5.(2024·河南郑州模拟)已知角α∈,且tan2α-3tan αsin α-4sin2α=0,则sin(α+2 023π)=( ) A. B. C.- D.- 6.集合A={sin α,cos α,1},集合B={sin2α,sin α+cos α,0},且A=B,则sin2 019α+cos2 018α=( ) A.0 B.1 C.-1 D.±1 7.(2024·山东聊城模拟)已知α,β∈,且满足sin αcos β-2cos αsin β=0,则tan(2π +α)+tan的最小值为( ) A.2 B. C.1 D.2 8.(2024·河北衡水模拟)已知cos=,且-π<α<-,则cos=( ) A. B. C.- D.- 9.黑洞原指非常奇怪的天体,它体积小,密度大,吸引力强,任何物体到了它那里都 别想再出来.数字中也有类似的“黑洞”,任意取一个数字串,长度不限,依次写出该数 字串中偶数的个数、奇数的个数以及总的数字个数,把这三个数从左到右写成一个新数字 串;重复以上工作,最后会得到一个反复出现的数字,我们称它为“数字黑洞”,如果把 这个数字设为a,则sin=( ) A. B.- C. D.- 二、多项选择题 10.在△ABC中,下列结论正确的是( ) A.sin(A+B)=sin C B.sin=cos C.tan(A+B)=-tan C D.cos(A+B)=cos C三、填空题与解答题 11.(2024·北京模拟)已知函数f(x)=sin 2x.若非零实数 a,b,使得f(x+a)=bf(x)对 x∈R都成立,则满足条件的一组值可以是a=________,b=________.(只需写出一组) 12.若sin(3π+θ)=,则+=________. 13.已知关于x的方程2x2-(+1)x+m=0的两根分别是sin θ和cos θ,θ∈(0,2π),求: (1)+的值; (2)m的值; (3)方程的两根及此时θ的值. 高分推荐题 14.(2024·名师原创)已知α,β∈(0,2π),且α<β,若关于x的方程(x+sin α)(x+sin β) +1=0有实数根,则代数式=________. 解析版 一、单项选择题 1.下列各数中与sin 2 024°的值最接近的是( ) A. B. C.- D.- 解析:2 024°=5×360°+180°+44°, ∴sin 2 024°=-sin 44°和-sin 45°最接近,故选D. 答案:D 2.已知α为锐角,且2tan(π-α)-3cos+5=0,tan(π+α)+6sin(π+β)-1=0,则sin α =( ) A. B. C. D. 解析:由已知得消去sin β,得tan α=3,∴sin α=3cos α,代入sin2α+cos2α=1,化 简得sin2α=,则sin α=(α为锐角). 答案:C 3.在△ABC中,sin A·cos A=-,则cos A-sin A=( ) A.- B.- C. D.± 解析:∵在△ABC中,sin A·cos A=-, ∴A为钝角,∴cos A-sin A<0, ∴cos A-sin A=- =- =-=-. 答案:B 4.化简的结果是( ) A.sin 3-cos 3 B.cos 3-sin 3 C.±(sin 3-cos 3) D.以上都不对解析:sin(π-3)=sin 3,cos(π+3)=-cos 3, ∴原式= ==|sin 3-cos 3|. ∵<3<π,∴sin 3>0,cos 3<0. ∴原式=sin 3-cos 3,故选A. 答案:A 5.(2024·河南郑州模拟)已知角α∈,且tan2α-3tan αsin α-4sin2α=0,则sin(α+2 023π)=( ) A. B. C.- D.- 解析:因为tan2α-3tan αsin α-4sin2α=0,所以(tan α-4sin α)(tan α+sin α)=0,因 为α∈,所以tan α<0且sin α<0,所以tan α-4sin α=0,即=4sin α,所以cos α=,所 以sin α=-=-,所以sin(α+2 023π)=-sin α=. 答案:A 6.集合A={sin α,cos α,1},集合B={sin2α,sin α+cos α,0},且A=B,则sin2 019α+cos2 018α=( ) A.0 B.1 C.-1 D.±1 解析:当sin α=0时,sin2α=0,此时集合B中不符合集合元素的互异性,故舍去; 当cos α=0时,A={sin α,0,1},B={sin2α,sin α,0},此时sin2α=1,得sin α=-1(sin α=1舍去),所以sin2 019α+cos2 018α=-1.故选C. 答案:C 7.(2024·山东聊城模拟)已知α,β∈,且满足sin αcos β-2cos αsin β=0,则tan(2π +α)+tan的最小值为( ) A.2 B. C.1 D.2 解析:因为sin αcos β-2cos αsin β=0,α,β∈,所以tan α>0,tan β>0,tan α= 2tan β,所以tan(2π+α)+tan=tan α+=2tan β+≥2,当且仅当tan β=时等号成立. 答案:D 8.(2024·河北衡水模拟)已知cos=,且-π<α<-,则cos=( ) A. B. C.- D.- 解析:因为+=, 所以cos=sin=sin. 因为-π<α<-, 所以-<α+<-. 又cos=>0, 所以sin=-, 所以cos=-. 答案:D 9.黑洞原指非常奇怪的天体,它体积小,密度大,吸引力强,任何物体到了它那里都别想再出来.数字中也有类似的“黑洞”,任意取一个数字串,长度不限,依次写出该数 字串中偶数的个数、奇数的个数以及总的数字个数,把这三个数从左到右写成一个新数字 串;重复以上工作,最后会得到一个反复出现的数字,我们称它为“数字黑洞”,如果把 这个数字设为a,则sin=( ) A. B.- C. D.- 解析:根据“数字黑洞”的定义,任取数字2 021,经过第一步之后变为314,经过第 二步之后变为123,再变为123,再变为123,所以数字黑洞为123,即a=123, 所以sin=sin=sin=-cos=-. 答案:D 二、多项选择题 10.在△ABC中,下列结论正确的是( ) A.sin(A+B)=sin C B.sin=cos C.tan(A+B)=-tan C D.cos(A+B)=cos C 解析:在△ABC中,有A+B+C=π, 则sin(A+B)=sin(π-C)=sin C,A正确; sin=sin=cos,B正确; tan(A+B)=tan(π-C)=-tan C,C正确; cos(A+B)=cos(π-C)=-cos C,D错误. 答案:ABC 三、填空题与解答题 11.(2024·北京模拟)已知函数f(x)=sin 2x.若非零实数 a,b,使得f(x+a)=bf(x)对 x∈R都成立,则满足条件的一组值可以是a=________,b=________.(只需写出一组) 解析:当a=时,f=sin(2x+π)=-sin 2x,即b=-1,故当a=,b=-1时,f(x+a) =bf(x)对x∈R都成立.(答案不唯一) 答案: -1 12.若sin(3π+θ)=,则+=________. 解析:由sin(3π+θ)=, 可得sin θ=-, ∴+ =+ =+ = ===18. 答案:18 13.已知关于x的方程2x2-(+1)x+m=0的两根分别是sin θ和cos θ,θ∈(0,2π),求: (1)+的值;(2)m的值; (3)方程的两根及此时θ的值. 解:(1)原式=+ =+ ==sin θ+cos θ. 由条件知sin θ+cos θ=, 故+=. (2)由已知,得sin θ+cos θ=,sin θcos θ=, 又(sin θ+cos θ)2=1+2sin θcos θ,可得m=. (3)由 解得 或 又θ∈(0,2π),故θ=或θ=. 高分推荐题 14.(2024·名师原创)已知α,β∈(0,2π),且α<β,若关于x的方程(x+sin α)(x+sin β) +1=0有实数根,则代数式=________. 解析:整理方程(x+sin α)(x+sin β)+1=0,得x2+(sin α+sin β)x+sin αsin β+1=0. 由题意得Δ=(sin α+sin β)2-4sin αsin β-4≥0,即(sin α-sin β)2≥4①. 因为-1≤sin α≤1,-1≤sin β≤1, 所以sin α-sin β∈[-2,2], 从而(sin α-sin β)2≤4②. 由①②得sin α-sin β=±2, 所以或 因为α,β∈(0,2π)且α<β, 所以α=,β=,即 因此= ==. 答案:
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  1. CONNECT:[ UseTime:0.000607s ] mysql:host=127.0.0.1;port=3306;dbname=wenku;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001147s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000377s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000304s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000604s ]
  6. SELECT * FROM `set` [ RunTime:0.000212s ]
  7. SHOW FULL COLUMNS FROM `wendang` [ RunTime:0.000759s ]
  8. SELECT * FROM `wendang` WHERE `id` = 370247 LIMIT 1 [ RunTime:0.000654s ]
  9. UPDATE `wendang` SET `liulancishu` = 1 WHERE `id` = 370247 [ RunTime:0.001333s ]
  10. UPDATE `wendang` SET `lasttime` = 1773093285 WHERE `id` = 370247 [ RunTime:0.000641s ]
  11. SELECT * FROM `wendang` WHERE `id` < 370247 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000722s ]
  12. SELECT * FROM `wendang` WHERE `id` > 370247 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000545s ]
  13. SELECT * FROM `wendang` WHERE `id` <> 370247 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.006839s ]
  14. SELECT * FROM `wendang` WHERE `id` <> 370247 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.005630s ]
  15. SELECT * FROM `wendang` WHERE `id` <> 370247 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.012464s ]
0.174804s