cos(180/11)cos(360/11)cos(540/11)cos(720/11)cos(900/11)
来源:学生作业帮助网 编辑:六六作业网 时间:2024/12/23 07:53:24
cos(180/11)cos(360/11)cos(540/11)cos(720/11)cos(900/11)cos(180/11)cos(360/11)cos(540/11)cos(720/11)c
cos(180/11)cos(360/11)cos(540/11)cos(720/11)cos(900/11)
cos(180/11)cos(360/11)cos(540/11)cos(720/11)cos(900/11)
cos(180/11)cos(360/11)cos(540/11)cos(720/11)cos(900/11)
原式等于{sin(180/11)cos(180/11)cos(360/11)cos(540/11)cos(720/11)cos(900/11)}/sin(180/11)={1/8sin(1440/11)cos(540/11)cos(900/11)}/sin(180/11)
={1/8sin(180-540/11)cos(540/11)cos(90-90/11)}/sin(180/11)
={1/16sin(1080/11)sin(90/11)}/sin(180/11)
={1/16cos(90/11)sin(90/11)}/sin(180/11)
=1/32
cos(180/11)cos(360/11)cos(540/11)cos(720/11)cos(900/11)
化简1+cos(a-360)cos(a-180)-2cos^2a
cos (180/5)* cos(360/5)=?
cos^1度+cos^2度+cos^3度+……+cos^180度=?
cos
sin(360--x)cos(180+x)cos(90+x)
求值:cos^2 1度+cos^2 2度+…+cos^2 180度=___.
[1+cos.sin]/{cos+sin}的值域
化简:cos(-x)除以{cos(360度-x)*tan平方(180度-x) }—cos(90度+x)除以{cos平方(270度+x)*sin(-x) }=?答案等于-1
三角函数诱导公式化简(1)cos(-θ)/[cos(360°-θ)×tan^2(180°-θ)](2)cos(90°+θ)/[cos^2(270°+θ)×sin(-θ)]
cos(180+A)*sin(A+360)/sin(-A-180)*cos(-180-A)答案是1还是-1
.[1/cos(-α)+cos(180°+ α )]/[1/sin(540°-α)+sin(360°-α)]=tan^3α
化简 (1+sin a+ cos a)(sin a/2 - cos a/2) / √(2+2cos a)(180°
Cos x=1/7 Cos(x+y)=-11/14 x y 为锐角,求Cos y很急!
α,β为锐角,且cosα=1/7,cos(α+β)=-(11/14),cosβ=?
化简f(x)=2cos^3 x+sin^2 (360-x)-cos(180-x)-3 / 2+2cos^2(180+x)+cos(-x)求化简图片
cos(75+a)=1/3,-180
cos(a-360)=?