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高中數(shù)學(xué)二輪復(fù)習(xí)講義——選填題部分第6講三角函數(shù)單獨考查三角變換的題目較少,往往以解三角形為背景,在應(yīng)用正弦定理、余弦定理的同時,應(yīng)用三角恒等變換進行化簡,綜合性比較強,但難度不大.也可能與三角函數(shù)等其他知識相結(jié)合.三角函數(shù)的考查重點是三角函數(shù)的定義、圖象與性質(zhì),考查中以圖象的變換、函數(shù)的單調(diào)性、奇偶性、周期性、對稱性、最值作為熱點,并常與三角恒等變換交匯命題,難度為中檔偏下.題型一、三角恒等變換考點1.同角之間的關(guān)系、誘導(dǎo)公式1.已知角α的頂點與原點O重合,始邊與x軸的正半軸重合,若它的終邊經(jīng)過點P(2,1),則tan(2α+πA.﹣7 B.?17 C.12.已知sinα+cosβ=1,cosα+sinβ=0,則sin(α+β)=.3.若tanα=34,則cos2α+2sin2A.6425 B.4825 C.1 4.已知θ是第四象限角,且sin(θ+π4)=35,則tan(θ?π4)考點2.兩角和與差角公式、二倍角公式、輔助角公式1.已知向量a→=(1,sinα),b→=(2,cosα),且a→∥b→2.已知sinx﹣siny=?23,cosx﹣cosy=23且x,y為銳角,則tan(x﹣3.已知sinθ+sin(θ+π3)=1,則sin(θA.12 B.33 C.234.已知α∈(π2,π),并且sinα+2cosα=25,則tan(A.?1731 B.?3117 C.?5.若α,β∈(0,π2),cos(α?β2)=3A.?32 B.?12 C.6.已知tan(α﹣β)=12,tanβ=?17,且α,β∈(0,πA.π4 B.πC.?3π4 7.已知α∈(0,π2),2sin2α﹣cos2A.15 B.55 C.358.若α∈(0,π),且sinα﹣2cosα=2,則tanα2A.3 B.2 C.12 D.考點3.三角恒等變換綜合1.若sinβ=3sin(2α﹣β),則2tan(α﹣β)+tanα的值為.2.已知2+5cos2α=cosα,cos({2α+β})=45,α∈(0,π2),β∈(3π2,2A.?45 B.44125 C.?3.若SKIPIF1<0,則(

)A.SKIPIF1<0 B.SKIPIF1<0C.SKIPIF1<0 D.SKIPIF1<04.若SKIPIF1<0,SKIPIF1<0,則SKIPIF1<0(

)A.SKIPIF1<0 B.SKIPIF1<0C.SKIPIF1<0 D.SKIPIF1<05.已SKIPIF1<0,且SKIPIF1<0則SKIPIF1<0等于(

)A.SKIPIF1<0 B.SKIPIF1<0 C.SKIPIF1<0 D.SKIPIF1<06.已知角SKIPIF1<0,且SKIPIF1<0,SKIPIF1<0,則SKIPIF1<0(

)A.SKIPIF1<0 B.SKIPIF1<0 C.SKIPIF1<0 D.2題型二、三角函數(shù)的圖像考點1.伸縮變換1.要得到函數(shù)y=3sin(2x+π3)的圖象,只需要將函數(shù)y=3cos2A.向右平行移動π12個單位B.向左平行移動π12個單位C.向右平行移動π6個單位D.向左平行移動π62.已知曲線C1:y=cosx,C2:y=sin(2x+2πA.把C1上各點的橫坐標(biāo)伸長到原來的2倍,縱坐標(biāo)不變,再把得到的曲線向右平移π6個單位長度,得到曲線C2B.把C1上各點的橫坐標(biāo)伸長到原來的2倍,縱坐標(biāo)不變,再把得到的曲線向左平移π12個單位長度,得到曲線C2C.把C1上各點的橫坐標(biāo)縮短到原來的12,縱坐標(biāo)不變,再把得到的曲線向右平移π6個單位長度,得到曲線CD.把C1上各點的橫坐標(biāo)縮短到原來的12,縱坐標(biāo)不變,再把得到的曲線向左平移π12個單位長度,得到曲線3.已知函數(shù)f(x)=Asin(ωx+φ)(A>0,ω>0,|φ|<π)是奇函數(shù),且f(x)的最小正周期為π,將y=f(x)的圖象上所有點的橫坐標(biāo)伸長到原來的2倍(縱坐標(biāo)不變),所得圖象對應(yīng)的函數(shù)為g(x).若g(π4)=2,則f(A.﹣2 B.?2 C.2 4.函數(shù)y=cos(2x+φ)(﹣π≤φ<π)的圖象向右平移π2個單位后,與函數(shù)y=sin(2x+π3)的圖象重合,則φ5.若y=|3sin(ωx+π12)+2|的圖象向右平移π6個單位后與自身重合,且y=tanωx的一個對稱中心為(π48,0),則6.將函數(shù)f(x)=3sin2x的圖象向右平移φ(0<φ<π2)個單位后得到函數(shù)g(x)的圖象,若對滿足|f(x1)﹣g(x2)|=6的x1,x2,有|x1﹣x2|min=πA.5π12 B.π3 C.π4考點2.求解析式1.圖是函數(shù)y=Asin(ωx+φ)(x∈R)在區(qū)間[?π6,5π6]上的圖象,為了得到這個函數(shù)的圖象,只要將yA.向左平移π3個單位長度,再把所得各點的橫坐標(biāo)縮短到原來的12B.向左平移π3個單位長度,再把所得各點的橫坐標(biāo)伸長到原來的2倍,縱坐標(biāo)不變C.向左平移π6個單位長度,再把所得各點的橫坐標(biāo)縮短到原來的12D.向左平移π62.已知函數(shù)f(x)=Asin(ωx+φ)(其中A,ω,φ為常數(shù),且A>0,ω>0,|φ|<π2)的部分圖象如圖所示,若f(α)=3A.?34 B.?18 C.3.已知函數(shù)f(x)=Asin(π3x+?),x∈R,A>0,0<?<π2.y=f(x)的部分圖象如圖所示,P,Q分別為該圖象的最高點和最低點,PR垂直x軸于點R,R的坐標(biāo)為(1,0),若∠A.12 B.32 C.344.已知函數(shù)f(x)=Atan(ωx+φ)(ω>0,|φ|<π2)的部分圖象如圖所示,下列關(guān)于函數(shù)g(x)=Acos(ωx+φ)(x∈A.函數(shù)g(x)的圖象關(guān)于點(π4,0B.函數(shù)g(x)在[?π8C.函數(shù)g(x)的圖象關(guān)于直線x=π8D.函數(shù)h(x)=cos2x的圖象上所有點向左平移π4個單位得到函數(shù)g(x題型三、三角函數(shù)的最值、取值范圍1.函數(shù)f(x)=15sin(x+π3A.65 B.1 C.35 2.已知函數(shù)f(x)=2sinx+sin2x,則f(x)的最小值是.3.已知函數(shù)f(x)=2sin2(π4+x)?3cos2x,x∈[π4,π2].若不等式|f(x)﹣m|<2在x∈[π4,4.已知函數(shù)SKIPIF1<0,下列說法錯誤的是(

)A.SKIPIF1<0是偶函數(shù) B.SKIPIF1<0是周期為π的函數(shù)C.SKIPIF1<0在區(qū)間SKIPIF1<0上單調(diào)遞減 D.SKIPIF1<0的最大值為SKIPIF1<0題型四、三角函數(shù)的性質(zhì)考點1.三角函數(shù)的單調(diào)性1.函數(shù)y=sin(?2x+π3)2.已知ω>0,函數(shù)f(x)=sin(ωx+π4)在區(qū)間(π2,πA.[12,54] B.3.已知函數(shù)f(x)=4sinωx2?cosωx2(ω>0)在區(qū)間[?π2,A.(0,1] B.(0,34] C.[12,34考點2.三角函數(shù)的奇偶性1.已知f(x)=sin(x+φ)+cos(x+φ)為奇函數(shù),則φ的一個取值是()A.π2 B.?π2 C.π2.已知f(x)=3sin2x+acos2x,其中a為常數(shù).f(x)的圖象關(guān)于直線x=π6對稱,則f(A.[?35π,?16π] B.[?712π,?13π] C.[?163.已知函數(shù)f(x)=sinωx+cosωx(ω>0),x∈R,若函數(shù)f(x)在區(qū)間(﹣ω,ω)內(nèi)單調(diào)遞增,且函數(shù)y=f(x)的圖象關(guān)于直線x=ω對稱,則ω的值為.考點3.三角函數(shù)的周期性與對稱性1.已知函數(shù)f(x)=sin(ωx+π4)(ω>0)在(π12,π32.已知函數(shù)f(x)=2sin(ωx+π4)(ω>0)的圖象在區(qū)間[0,1]上恰有3個最高點,則A.[19π4,27π4) B.[9π2,13π2) C.[17π4,25π4)3.設(shè)函數(shù)f(x)=Asin(ωx+φ)(A,ω,φ是常數(shù),A>0,ω>0)若f(x)在區(qū)間[π6,π2]上具有單調(diào)性,且f(π2)=f(2π3)=﹣f(π6),則f4.已知函數(shù)f(x)=sin(ωx+φ)(ω>0,|φ|≤π2),x=?π4為y=f(x)圖象的對稱軸,x=π4為f(x)的零點,且fA.13 B.12 C.9 D.55.已知函數(shù)f(x)=sin(ωx+φ),其中ω>0,|φ|≤π2,?π4為f(x)的零點:且f(x)≤|f(π4)|恒成立,f(xA.11 B.13 C.15 D.176.已知ω>0,函數(shù)f(x)=acos2ωx﹣4cosωx+3a,若對任意給定的a∈[﹣1,1],總存在x1,x2∈[0,π2](x1≠x2),使得f(x1)=f(x2)=0,則ωA.2 B.4 C.5 D.6題型五、三角函數(shù)的零點1.已知函數(shù)f(x)=3sinωxcosωx+cos2ωx?12,(ω>0,x∈R),若函數(shù)f(x)在區(qū)間(πA.(0,512] B.(0,512]∪[5C.(0,58] D.(0,56]∪[2.已知函數(shù)f(x)=2sin(ωx?π6)sin(ωx+π3)(ω>0),若函數(shù)g(x)=f(x)+3A.[2,113) B.(2,113) C.[73,103.函數(shù)f(x)=2sin(2x+π3),g(x)=mcos(2x?π6)﹣2m+3>0,m>0,對任意x1∈[0,π4],存在x2∈[0,π4],使得g(x1)=f(x4.設(shè)函數(shù)SKIPIF1<0在區(qū)間SKIPIF1<0恰有三個極值點、兩個零點,則SKIPIF1<0的取值范圍是(

)A.SKIPIF1<0 B.SKIPIF1<0 C.SKIPIF1<0 D.SKIPIF1<0一、單選題1.已知SKIPIF1<0,則SKIPIF1<0(

)A.SKIPIF1<0 B.SKIPIF1<0 C.SKIPIF1<0 D.SKIPIF1<02.函數(shù)SKIPIF1<0的圖像可能是(

)A. B.

C.

D.

3.在平面直角坐標(biāo)系中,角SKIPIF1<0的頂點為坐標(biāo)原點,始邊在x軸的正半軸上,終邊過點SKIPIF1<0,且SKIPIF1<0,則SKIPIF1<0(

)A.SKIPIF1<0 B.SKIPIF1<0 C.SKIPIF1<0 D.SKIPIF1<04.設(shè)SKIPIF1<0,若SKIPIF1<0,則SKIPIF1<0(

)A.SKIPIF1<0 B.SKIPIF1<0C.SKIPIF1<0 D.SKIPIF1<05.函數(shù)SKIPIF1<0的最小正周期是(

)A.SKIPIF1<0 B.SKIPIF1<0 C.SKIPIF1<0 D.SKIPIF1<06.將函數(shù)SKIPIF1<0(SKIPIF1<0)的圖象向左平移SKIPIF1<0個單位長度,得到偶函數(shù)SKIPIF1<0的圖象,則SKIPIF1<0(

)A.SKIPIF1<0 B.SKIPIF1<0 C.SKIPIF1<0 D.SKIPIF1<07.將函數(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,若直線SKIPIF1<0是SKIPIF1<0圖象的一條對稱軸,則SKIPIF1<0的值可能為(

)A.SKIPIF1<0 B.SKIPIF1<0 C.SKIPIF1<0 D.SKIPIF1<08.已知函數(shù)SKIPIF1<0,若SKIPIF1<0在區(qū)間SKIPIF1<0上的值域是SKIPIF1<0,則a的取值范圍為(

)A.SKIPIF1<0 B.SKIPIF1<0C.SKIPIF1<0 D.SKIPIF1<09.已知函數(shù)SKIPIF1<0在SKIPIF1<0上存在最值,且在SKIPIF1<0上單調(diào),則SKIPIF1<0的取值范圍是(

)A.SKIPIF1<0 B.SKIPIF1<0 C.SKIPIF1<0 D.SKIPIF1<010.如圖,直線SKIPIF1<0與函數(shù)SKIPIF1<0的圖象的三個相鄰的交點為A,B,C,且SKIPIF1<0,SKIPIF1<0,則SKIPIF1<0(

A.SKIPIF1<0 B.SKIPIF1<0C.SKIPIF1<0 D.SKIPIF1<011.將函數(shù)SKIPIF1<0的圖像向左平移SKIPIF1<0個單位長度后得到函數(shù)SKIPIF1<0的圖像,再將SKIPIF1<0的圖像上各點的縱坐標(biāo)不變、橫坐標(biāo)變?yōu)樵瓉淼腟KIPIF1<0(SKIPIF1<0)倍,得到函數(shù)SKIPIF1<0的圖像,且SKIPIF1<0在區(qū)間SKIPIF1<0上恰有兩個極值點、兩個零點,則SKIPIF1<0的取值范圍為(

)A.SKIPIF1<0 B.SKIPIF1<0 C.SKIPIF1<0 D.SKIPIF1<012.已知函數(shù)SKIPIF1<0,則下列說法中正確的是(

)A.若函數(shù)SKIPIF1<0的最小正周期為π,則SKIPIF1<0在SKIPIF1<0上不單調(diào)B.若函數(shù)SKIPIF1<0的最小正周期為π,則直線SKIPIF1<0是函數(shù)SKIPIF1<0圖象的一條對稱軸C.若函數(shù)SKIPIF1<0在SKIPIF1<0上恰有3個極值點,則SKIPIF1<0D.若函數(shù)SKIPIF1<0在SKIPIF1<0上單調(diào),則SKIPIF1<013.將函數(shù)SKIPIF1<0圖象上所有點的橫坐標(biāo)縮小為原來的SKIPIF1<0,再向右平移SKIPIF1<0個單位長度,得到函數(shù)SKIPIF1<0的圖象,若SKIPIF1<0在SKIPIF1<0上有兩個不同的零點SKIPIF1<0,SKIPIF1<0,則SKIPIF1<0(

)A.SKIPIF1<0 B.SKIPIF1<0 C.SKIPIF1<0 D.SKIPIF1<014.已知函數(shù)SKIPIF1<0,若函數(shù)SKIPIF1<0的最小正周期為SKIPIF1<0,且SKIPIF1<0對任意的SKIPIF1<0恒成立,則SKIPIF1<0的最小值為(

)A.SKIPIF1<0 B.SKIPIF1<0 C.SKIPIF1<0 D.SKIPIF1<0二、多選題15.已知函數(shù)SKIPIF1<0的部分圖象如圖所示,則下列說法正確的是(

)A.函數(shù)SKIPIF1<0的圖象關(guān)于直線SKIPIF1<0對稱B.函數(shù)SKIPIF1<0的圖象關(guān)于點SKIPIF1<0對稱C.函數(shù)SKIPIF1<0在SKIPIF1<0的值域為SKIPIF1<0D.將函數(shù)SKIPIF1<0的圖象向右平移SKIPIF1<0個單位,所得函數(shù)為SKIPIF1<016.函數(shù)SKIPIF1<0的部分圖象如圖所示,則下列說法中正確的是(

)A.SKIPIF1<0B.SKIPIF1<0的圖象向右平移SKIPIF1<0個單位長度后得到的新函數(shù)是偶函數(shù)C.SKIPIF1<0的圖象向右平移SKIPIF1<0個單位長度后得到的新函數(shù)是奇函數(shù)D.若方程SKIPIF1<0在SKIPIF1<0上有且只有6個根,則SKIPIF1<017.已知函數(shù)SKIPIF1<0,則(

)A.SKIPIF1<0為偶函數(shù)B.SKIPIF1<0是SKIPIF1<0的一個單調(diào)遞增區(qū)間C.SKIPIF1<0D.當(dāng)SKIPIF1<0時,SKIPIF1<018.已知函數(shù)SKIPIF1<0,則(

)A.SKIPIF1<0的圖象關(guān)于直線SKIPIF1<0軸對稱B.SKIPIF1<0的圖象關(guān)于點SKIPIF1<0中心對稱C.SKIPIF1<0的所有零點為SKIPIF1<0D.SKIPIF1<0是以SKIPIF1<0為周期的函數(shù)19.已知函數(shù)SKIPIF1<0,SKIPIF1<0,SKIPIF1<0,SKIPIF1<0,它們的最小正周期均為SKIPIF1<0,SKIPIF1<0的一個零點為SKIPIF1<0,則(

)A.SKIPIF1<0的最大值為2B.SKIPIF1<0的圖象關(guān)于點SKIPIF1<0對稱C.SKIPIF1<0和SKIPIF1<0在SKIPIF1<0上均單調(diào)遞增D.將SKIPIF1<0圖象向左平移SKIPIF1<0個單位長度可以得到SKIPIF1<0的圖象20.已知點SKIPIF1<0是函數(shù)SKIPIF1<0的圖象的一個對稱中心,則(

)A.SKIPIF1<0是奇函數(shù)B.SKIPIF1<0,SKIPIF1<0C.若SKIPIF1<0在區(qū)間SKIPIF1<0上有且僅有SKIPIF1<0條

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