tan(-2010°)+cos(-79π/6)
若α∈(0,π/6) 比较tan(sinα),tan(cosα),tan(tanα)的大小
【sin330°*tan(-13π/3)】/【cos(-19π/6)*cos690°】
[sin330°-tan(-13π/3)]/[cos(-19π/6)-cos690°]
cos(19π/6)+tan(16π/3)=?
cosπ/3+tanπ/4+3tan²π/6+sinπ/2+cosπ+sin3π/2等于?.
tan(-11π/6)、sin(-16π/3)、cos120°、cos(-180°-β)的求解过程.
求下列各三角函数值:(1)sin(-1920°) (2)cos(-1560°) (3)tan(-17π/6)
SIN(-7/6π),cos(15/4π),tan(-8/3π),tan(33/4π)
求证tan(2π-α)sin(-2π-α)cos(6π-α)/cos(α-π)sin(5π-α)=-tanα
求证(tan(2π-θ)sin(2π-θ)cos(6π-θ))/((-cosθ)sin(5π+θ))=tanθ
一 求值tan(55+α)*tan(35+α)-cos^2(π/3-α)-cos^2(π/6+α)二 如图由已知怎么得到
已知tanα/2=2,1.求tan(α+π/4)的值 2.(6sinα+cosα)/(3sinα-2cosα)的值