-cos2兀
![cos(2a-π/2) =cos(π/2 -2a) =sin2a 请问这是怎么转换的呢](https://imgs.wantubizhi.com/img/735A5D1F980B52A636CC46F12F2D1A7347862484A4CF4C88A73ACE15379C338C24462071E77D1D8920AA6EABF129C917913E811619A53E1EC93A787F994B8EBA048453769150071C9A88D700304459CD8EA1AF0AFA699AB47116BEE44064A5F8)
cos(2a-π/2) =cos(π/2 -2a) =sin2a 请问这是怎么转换的呢
图片尺寸338x600![化简cosx/2 cos(x/2-3兀/2)](https://imgs.wantubizhi.com/img/735A5D1F980B52A636CC46F12F2D1A73D2FEB83AD4E0A0F1776AC98FF019820911565BB46F750922FCDC815219F6345EAFD9DA941A129A4249CB87DE6F49E0467ACD8D190D5C06ECA11B0A08D73353F7DFF52943090B81017C52CC942BAB23B0)
化简cosx/2 cos(x/2-3兀/2)
图片尺寸780x1052![y=-2cos(2x一-3分之兀)的对称轴对称中心](https://imgs.wantubizhi.com/img/735A5D1F980B52A636CC46F12F2D1A739A593BF4A8EB4C2A50961F05FB435D88FB1E929A453035EB2DCADD22E92B621208CAB30418528B954EDE631553F27807ED29F12E03C76AE7B128B083687C8E36D8E2CAEB72F7ED9F51165CC72729E30F)
y=-2cos(2x一-3分之兀)的对称轴对称中心
图片尺寸2448x3264![前面基本知道 就是不知道最后 cos的-2次方兀](https://imgs.wantubizhi.com/img/735A5D1F980B52A636CC46F12F2D1A7338FB3F0F1F6D37AAEE7A6A202390F8C99671A95F57C2A0C4A7996B3706EC6FA8F78103F25D25B7714418D7C3729436DFA3413D9D7EA222BA8F5D860F9D23FADDCFF84EECEEEE90BE967836E528B62DE5)
前面基本知道 就是不知道最后 cos的-2次方兀
图片尺寸450x337![把cos^2(x 4/兀)化成sin2x的形式,求大神赐教](https://imgs.wantubizhi.com/img/735A5D1F980B52A636CC46F12F2D1A738AEF1A124B424AFFE3311BE2FA2BBD832EB1FDF5ACE8C650A2140DA5C9ED6FA4468543B4E0D700E3AC2A163D7E2AA3E6B0226A429A1EDD290940F5E65A52CAF61DC7E5464CCD4FB5DE1CE1DE1D64D0F6)
把cos^2(x 4/兀)化成sin2x的形式,求大神赐教
图片尺寸864x1152![高一数学cos二分之21π等于多少](https://imgs.wantubizhi.com/img/735A5D1F980B52A636CC46F12F2D1A73488E3D21213E5AD6F3A6E4E3A52C846CFCE077C5474B2A02CDDEAD3295FB977C9891FBE1FED3DE543F5384971B067B5DE082A52EDF9871D91EB9E9D75CB96A54F0F4617F1A05A25B056DAF948EB3ED22)
高一数学cos二分之21π等于多少
图片尺寸744x992![已知cosα=-,且α属于(0,2π),求α. 2.](https://imgs.wantubizhi.com/img/A1A61BAA66193547F3A6DD7D8EE527E9A4450A667229BF30A4368C2B0A421678F3BF8E175311C441C45199E2F721BB2721E917F133216B82E1C37C268BB4A6F03334346AEC159BD75BE6C9002AC092C74F754D9BD327DE7F616FDF144DD14173)
已知cosα=-,且α属于(0,2π),求α. 2.
图片尺寸780x1040![请问双纽线ρ^2=2cos2θ与圆ρ=1围成面积的公共部分.](https://imgs.wantubizhi.com/img/ADDA3C5D760C6828B77B505A29D43E83869F9A84D03665C782A93F54D7E613490B89C26D05A5DCCC0C69A3C9445FCEE3199BB5EDC9379FC617DE657E1F93BD0007EF69D4205371B385EACEADA3685EEAE9750EBD1235D63734F58ED27CC163BD)
请问双纽线ρ^2=2cos2θ与圆ρ=1围成面积的公共部分.
图片尺寸600x450![y=2cos1/2x y=2cos(x-π/2) y=cos(1/2x π/4) 这三个函数](https://imgs.wantubizhi.com/img/A1A61BAA66193547F3A6DD7D8EE527E90F7A31528C026A7998F1A12186558E483FFE723B315CA44957FF37A9F77D24912C771BBD4C10673C5E552FEF1476FB16C3CE4E07407F2D9B0F99F6FF27A5DCBF502D4692AD01E0C34EADAAEA72045027)
y=2cos1/2x y=2cos(x-π/2) y=cos(1/2x π/4) 这三个函数
图片尺寸600x290![已知α属于[π/2,π],cos2α=3/5,则tanα=](https://imgs.wantubizhi.com/img/A1A61BAA66193547F3A6DD7D8EE527E9C87DE2E7100640A2A5396D508BDBDC8772E21BE2BC6689E343BE179468A6E98C62303E1594AF55E11166F6FD64D39AB1003AD18D42F5BFEA70421F4F062A99C04F811E89963D81918CE0B90672129EFC)
已知α属于[π/2,π],cos2α=3/5,则tanα=
图片尺寸459x816![cos(π-α)=1/2,则cos2α](https://imgs.wantubizhi.com/img/A1A61BAA66193547F3A6DD7D8EE527E906D23DC5BE60BCFD6047D7977851A80836DEC618C60A957C9991406177278322F11AA5BEE0869E2595A5C0717BACBEDC1E52B30E81F6977CACA067D72DB1170B2B7F030E155A35FD617BCCDB3E738A59)
cos(π-α)=1/2,则cos2α
图片尺寸744x992![在三角形中,若cos(a-兀/3)=2cosa,求a的值](https://imgs.wantubizhi.com/img/735A5D1F980B52A636CC46F12F2D1A73B184B2084E98FCBA3A551818D9D419F76E3277BFC4AEDBEA4102F4B4E09AF2332CA44AF3AA6708A560BCC1A6FFA312C2C71250F95DD119F7B593C51FC148F20CFD41B87FC07A257BF98D991E4B8453A0)
在三角形中,若cos(a-兀/3)=2cosa,求a的值
图片尺寸360x480![已知sinα cosα=1/3且0 α π求sin2α cos2α tan2α的值](https://imgs.wantubizhi.com/img/A1A61BAA66193547F3A6DD7D8EE527E9A73BE47ED1B1F34DDE31B027A0DBCB744F5800BF2F663201AA0978841CF525F64B4C076C35E02CC91C758CD4D525924F6290B3F07B75F8B3666FED94F47FA6366726A1F63AFE2CB5DBF4DB88F2B30449)
已知sinα cosα=1/3且0 α π求sin2α cos2α tan2α的值
图片尺寸600x800![已知sin(∝-2π)=3/5,求cos(2π ∝)tan(∝-π)的值](https://imgs.wantubizhi.com/img/A1A61BAA66193547F3A6DD7D8EE527E9AB63B49854FF92272E3128C80B578713259E27E29320136B47B7DEEC7E8D641E29D8D62BBB7B88DE82026A8F9B14E9E287029F6C867C7CDD472A1B30A20110D8B6493217FC9E626BF7E361EE402AACCF)
已知sin(∝-2π)=3/5,求cos(2π ∝)tan(∝-π)的值
图片尺寸744x992![求定积分0πcos《(x/2)》^2](https://imgs.wantubizhi.com/img/A1A61BAA66193547F3A6DD7D8EE527E9CE5C1285301B2ED38E8C3ED35BAFBC311EC2A2EC7F9CDAA36787C9CA358FBF50ED1F763FFC3319C6FBD27849DEE56127C69EE05BA2B1E57B60ADE3146035AA6CDB321FD9BFB08F45BDACD481CFB8927A)
求定积分0πcos《(x/2)》^2
图片尺寸1328x747![化简f(x)=4sin2(兀/4 x)-2厂3·cos2x-1](https://imgs.wantubizhi.com/img/A1A61BAA66193547F3A6DD7D8EE527E95FBC3C2556DF129887BF6203DF48EC20C442DCF7EF5C400516021A97BB1FA9831E18B379507E225144B4C9B4447E090E7A48BB810391A26DD7BB13467C1FE79D41BD06B51C41D885DE0EEB950BAE38BB)
化简f(x)=4sin2(兀/4 x)-2厂3·cos2x-1
图片尺寸744x992![试画出函数y=sinx/2|cosx/2| cosx/2|sinx/2|在x∈[-2π,2π]上的大致](https://imgs.wantubizhi.com/img/735A5D1F980B52A636CC46F12F2D1A73BFCDE76E2C165DBFE7625CDCDA71326E720019C4B3ABEF1FFB64F78B51D9804E8A0F42848A435CEEB132FD70C302C4BFA977978CBB067398344C45FFFBDD6A1E1C045CED55BD85C4F5DAB5778BDA2698)
试画出函数y=sinx/2|cosx/2| cosx/2|sinx/2|在x∈[-2π,2π]上的大致
图片尺寸600x307![用拉格朗日定理推论:arcsinx arccosx=兀/2(-1 ≤x ≤1)](https://imgs.wantubizhi.com/img/ADDA3C5D760C6828B77B505A29D43E83297579055DB3390F15D43999AB9963FD1EF6FC191D98D7D013D500078C47EA8FC53102EBEA3AFA3CD4B7A2DDF110E862569A04FC6DA9EA15E3B7001A10FBC7D70DABAF22B09528A9823BA9B488790BFD)
用拉格朗日定理推论:arcsinx arccosx=兀/2(-1 ≤x ≤1)
图片尺寸744x992![y=2cos(1/2x-π/3) 1在一个周期的闭区间的图像,并根据图像直接写出](https://imgs.wantubizhi.com/img/A1A61BAA66193547F3A6DD7D8EE527E979AF20CE73C4C6723645C0D462BABFDC5AA56A44DD8F74DB5C7E0DB9121B531433E593F17DD1BCA7D7ABB4D78DCDDE1DFD222AE7C90F828FAE7BC23B089347FD0EC3B6D2CFEF153F02CE97728397FE67)
y=2cos(1/2x-π/3) 1在一个周期的闭区间的图像,并根据图像直接写出
图片尺寸660x386![sinx cosx=√2cos(π/2-t)怎么算的?](https://imgs.wantubizhi.com/img/735A5D1F980B52A636CC46F12F2D1A73C2AFA0D473733F99E8C124459934AEE48401AD1A364A3E1361AF69EAE41BA358FFB81715FAC700233F9938C3B19BFF0015659D1050DF1516B8FBB817A55B287676A7DA0FF4F5B0DBFE9D04768AC16B98)
sinx cosx=√2cos(π/2-t)怎么算的?
图片尺寸816x460