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高高考数学真题专题精讲精练-三角函数与平面向量（2021年整理）2π1.201919Cy=cosxCy=sin(2x+)123πAC126C2πBC2112C21πCC126C21πDC1212C2D2f(x)=cos(x+)38Af(x)−2πBy=f(x)x=3Cf(x+π)x=Df(x)(,π)62D2T2T2kkZk1fx12Ak3xkkZxkkZ338y=f(x)x=Bfxcosxcosx333xkkZxkkZk0f(x+π)x=326654Cx,x,DD.23633ABCDAB=1AD=2PCBD.APAP=ABAB+ADAD+A3B22C5D2A2z21z3z33A.151442019II12ABC2PABCPAPA(PBPC)34A.2B.C.D.123BBCBCxADyDA(0,3)B(1,0)C(1,0)P(x,y)PPAA(((x,3y)PBPB(((111x,y)PCPC(1((1x,y)223233PA(PBPC)2x2y(3y)2x2(y)PBPC(((22x,2y)PA(())222233B.P(0,)2252019113ab60°|a|=2|b|=1|a+2b|=.233262019II14fxsinx3cosx.x0,421232132fx1cosx3cosxcosx3cosxcosx14423x0,cosx0,1cosxfx1.222BCABCabcABC3sinA1sinBsinC;26cosBcosC=1a=3ABC.2B2019II17ABCABCa,b,csinAC8sin21cosBac6ABCb2.22B(1)ABCsinB8sinsinB41cosB.221517cosB32cosB150cosB1()cosB.1715814172cosBsinBSABC=acsinBac.SABC=2ac.1717217222221715