cos(a-3π)
![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![0回答 求指点π f(x)=sin(2x π 4) cos(2x 4) cos(2x ππ c..](https://imgs.wantubizhi.com/img/ADDA3C5D760C6828B77B505A29D43E835C3272AF3A9CD49B5B96BD97391AA801FF3A3576BB81EDFF05545DB8AFEAC910D47CC2D783C787544C26D497E7ABB38AE30A5B950714DAD7C26D209EA22B9AD0A5B89235800CF109D71F88306D188C48)
0回答 求指点π f(x)=sin(2x π 4) cos(2x 4) cos(2x ππ c..
图片尺寸777x332![求y=cos(2x π/3)的最值](https://imgs.wantubizhi.com/img/A1A61BAA66193547F3A6DD7D8EE527E96ED70BCD5E24DBDC341690BF6C2FD203D70372A1C2D517ED7D3667526317B714CA0255BB76AACD8DEB3C781EA04296B7022A71B10E73C3FDC1C21AFE2ED1F3946AD80F47298573B59FD2B63DDF71119D)
求y=cos(2x π/3)的最值
图片尺寸491x166![函数y =cos ?2x -π3的部分图象可能是](https://imgs.wantubizhi.com/img/735A5D1F980B52A636CC46F12F2D1A7366D1E72D9C8B802AE535EE9695903CDF13C9CF2920C77B59DC82D44E11EDAEB8DE68D9EDEA41E7CE329DD2195E04E0952E5643C6759953CE7EEBDE1760943DFD314C8C84E1B534787F31AE379EDF2895)
函数y =cos ?2x -π3的部分图象可能是
图片尺寸655x397![π. 4.函数y =sin|x |的图象是](https://imgs.wantubizhi.com/img/ADDA3C5D760C6828B77B505A29D43E83BECC44C329E849C8F5A5960095A92161D542AA86B655C1D66F54D2FF1F2B2F584E3746B500672D862946BF83A85A228F0435DE57649373C1DD2CA2FCFAEEDA7797C388208A492D53A5EE0E4EDC147137)
π. 4.函数y =sin|x |的图象是
图片尺寸1606x942![已知cos[(3π a)/2]=-2/3则cos2a=](https://imgs.wantubizhi.com/img/735A5D1F980B52A636CC46F12F2D1A73814C05C136EB50DA7B384E88FE66A9E655C7DEF32FFFEB5E1A3689496D11D0485C019D2CB0F12D3ED70E2CB5456650EA4707A17F480E4DD09AE74BF6DF0023774DCA70BE1AA1AB229E3BCD978B8F3707)
已知cos[(3π a)/2]=-2/3则cos2a=
图片尺寸1350x742![s1=12∫π4π6r2dθ=a22∫π4π6cos2θdθ=a22×12sin2θ|π4π6=](https://imgs.wantubizhi.com/img/735A5D1F980B52A636CC46F12F2D1A73FF57A1CF9E1E37DE88A61734FD3EBD96EE48E0D6A5C4736D10521CD5FD77D9CB20EF8B65524EA0911021C79E9E73A4A66870FFF7C752FEEEA348CD87F51CFEF892C91EA84F4DC738AD80E864BBF704D3)
s1=12∫π4π6r2dθ=a22∫π4π6cos2θdθ=a22×12sin2θ|π4π6=
图片尺寸286x242![y =cos(4x -π3) d .y =cos(2x -π6](https://imgs.wantubizhi.com/img/A1A61BAA66193547F3A6DD7D8EE527E9E17044F76D1A84C3855F58097FC9C14FB8A6C9449110B9774F97F82153866D058F4E183A5CC0288DCF8412BCE92E7C9DFE262533435C89CE9ACF06CF4E71FE596BDAADFE2A81797A6577D55DCA8DE367)
y =cos(4x -π3) d .y =cos(2x -π6
图片尺寸862x458![0 α π,求cos(α-π/6)的值 43 2014-04-25 已知cos(π a)=4/5,求cos](https://imgs.wantubizhi.com/img/ADDA3C5D760C6828B77B505A29D43E8314171873860F159F77BFCC51D6B83CA71AD1C5AF933D839717EE3BAF45DC79DC2BAD8AE7BFE48F50E79E143EED3B0BA51D52EEF2EF8286C4EADF78DD4BAE289A4022D5DE78A4CD293328C7C325459EAD)
0 α π,求cos(α-π/6)的值 43 2014-04-25 已知cos(π a)=4/5,求cos
图片尺寸450x160![cos(a 2/3π怎么化简)](https://imgs.wantubizhi.com/img/ADDA3C5D760C6828B77B505A29D43E83DD7D7344597314288FB1C243C63653D147EEA63D5F865EC5F7FCD600C4463701A66B45F94E1D5BB4B3F6CE3043D08EC489C341076659841B0E399300D8794C8255E67E6C60C60BDF767D5F91A0980EA4)
cos(a 2/3π怎么化简)
图片尺寸581x1032![化简cos(π-a)tan(π a)/sin(2π a)](https://imgs.wantubizhi.com/img/A1A61BAA66193547F3A6DD7D8EE527E987CCE28E2606DC5684FBC32199C0BDFA318F944AEA437E4F6662912F660F3F79DE102504424CCFB88F74D82A8EF9EAE7D4462CFA8FD64B875433C8DA9420E88A89CD5ED9B09A1709CBF53BB10B7F6BF9)
化简cos(π-a)tan(π a)/sin(2π a)
图片尺寸480x640![比如ρ=a(1 cosθ)为什么是0到π,而ρ=2a](https://imgs.wantubizhi.com/img/735A5D1F980B52A636CC46F12F2D1A73B04B6681CD38EC6668858E1CBC6466A504415F2A6465A359DA9F20F91D6B8AAEB6AE16D32BC7E6A7F7B03F7D49F2B9A2BCBA06DD10AAEC58EAE7D13DA72D7D8853BB1BA733573ADC2620879045AAB82C)
比如ρ=a(1 cosθ)为什么是0到π,而ρ=2a
图片尺寸920x1632![答案是-3√3cosa 详细步骤写下 分享到: 17 分钟前 提问者](https://imgs.wantubizhi.com/img/735A5D1F980B52A636CC46F12F2D1A73AE98643D336C816EB93FE84D7A23F917928C4000F1473CE74C984CC6C6C2501A81CBEF57A78C669AEEE1C536D57B9766909CA4ED77171C917741204284CFADEDA619F6EE1300A51818444189EF616DBA)
答案是-3√3cosa 详细步骤写下 分享到: 17 分钟前 提问者
图片尺寸1052x780![已知cos(兀/6 a)*cos(派/3-a)=—1/4,a属于(派/3,派/2)1,求sin2已知](https://imgs.wantubizhi.com/img/735A5D1F980B52A636CC46F12F2D1A736EF01D36812C568FDD3C991FE4E88F1D156D02465E0CD199638F9E3FA030B1E68998B8AD82D196E7310C113FEC9A5367986A2160A5454ED89CCC6BDD6E71B51FCE7F0F28F127E5537DDAF803A202B063)
已知cos(兀/6 a)*cos(派/3-a)=—1/4,a属于(派/3,派/2)1,求sin2已知
图片尺寸268x492![已知cos(a b)=12/13,cos(a-b)=3/5,且0 a b π/2,求sin2a的值](https://imgs.wantubizhi.com/img/A1A61BAA66193547F3A6DD7D8EE527E940040C4F96CCEB19E3DCB676CD8CCA09657C4204E9E8F18A275EE4C4A9B70B144FB31A996DDBD620A97CD87FADDFF8C7B7330AC7E0F1C56156A37EBECA3DC97FE494391F66EEF503DF100ABA5809BA4C)
已知cos(a b)=12/13,cos(a-b)=3/5,且0 a b π/2,求sin2a的值
图片尺寸744x992![2分之π),则cos(a-b)的值等于](https://imgs.wantubizhi.com/img/735A5D1F980B52A636CC46F12F2D1A7344F55225C17E23B3EB06D20FEB7F885BAAA058B2F947238D667E127EFDFF2C413926B84259142F2400BE2C0E47B2B6B2414511EA07D1EF9FD858FB7F72F7632276D118405179CB1EF0079A63B6AC6FD6)
2分之π),则cos(a-b)的值等于
图片尺寸1350x742![已知sin(兀/3-a)=根号3/3,求cos(7兀/6 a)](https://imgs.wantubizhi.com/img/ADDA3C5D760C6828B77B505A29D43E835803F12C833ED439D40578EB5A5502A11FCE48859C588BE54F6D3EAF1F766E3059771165F30A5313FCF93A6BC072D803654EF9FECD2FB80BFBFD63C0A98B64058F170CDAE28684866791DC4D66AF4C7F)
已知sin(兀/3-a)=根号3/3,求cos(7兀/6 a)
图片尺寸360x480![已知角a为三角形的一个内角,且cos(2π–a)=3/5,则cos(π/2–a/2)=](https://imgs.wantubizhi.com/img/ADDA3C5D760C6828B77B505A29D43E83AB42AE1363163FEA7383FE53D00AA3BCE66D705415D626439CDFDD1E8D062961BDEB10B5A52E74BC76BBCF910AC8C382ABCC1533B50E156D1E9C5D8B6A622D9F0486C3AB9D27EF4B2939E6FF369CE136)
已知角a为三角形的一个内角,且cos(2π–a)=3/5,则cos(π/2–a/2)=
图片尺寸1200x1600![角∝第二象限,阝锐角,且sin∝=4/5,sin阝=12/13求cos(∝-阝)](https://imgs.wantubizhi.com/img/ADDA3C5D760C6828B77B505A29D43E8328705567BAE5FC610A0D3AFED8C18F3AFBE67A78E0C2F6DD1047C78ED719DA16AA0EA351A56A8D0588BB47F9A3299BAD45272795A344B8CAE24970C5A97726E5954E3A0EB28BC37A7BF9F85DFD366091)
角∝第二象限,阝锐角,且sin∝=4/5,sin阝=12/13求cos(∝-阝)
图片尺寸359x480![sin(a十6分之兀)二5分之4则cos(a一3分之兀)](https://imgs.wantubizhi.com/img/735A5D1F980B52A636CC46F12F2D1A73DBA207251F529C380B118B366E5597E417372383E633CF8E3BA0AED5F7A9370E46313E3AA8144D0A7EFBFE91B78888302D1FDFDFF536B254BF6FE7138C4EFC4BB827BCC37EE3D444A53FB09B615A6CE6)
sin(a十6分之兀)二5分之4则cos(a一3分之兀)
图片尺寸744x992