怎么化简sinθ*1/2-cosθ*根号3/2成sin(θ-pai/3)
[tan(pai-a)cos(2pai-a)sin(-a+3pai/2)]/[cos(-a-pai)sin(-pai-a
sin(x+pai/3)+2sin(x-pai/3)-3^1/2 cos(2pai/3-x)化简得〇,
化简!f(x)=sin(pai-x)cos(3/2pai+x)+sin(pai+x)sin(3/2pai-x)
化简:[cos(a+pai)*sin^2(a+pai)]/[tan^2(pai+a)*cos^3a]
sin(Pai/12)-根号3*cos(Pai/12)等于多少,怎么算
(sinθcosπ/3)-(cosθsinπ/3)怎么化简得sin(θ-π/3)
sin(x-2pai)-cos(pai-x)=(1-根号3)/2,x是第二象限的角.求:(1)sinx与cosx的值(2
已知cos(x-pai/4)=根号2/10,x€(pai/2,3pai/4).(1)求sinx的值(2)求sin(2x+
f(x)=(sinx)平方+2根号3sin(x+pai/4)cos(x-pai/4)-(cosx)平方-根号3
已知tanθ=根号2,求(1)(cosθ+sinθ)/(cosθ-sinθ);(2)sin²θ-sinθcos
sin(pai/6+a)=1/3,则cos(2pai/3-2a)=?
若sin(pai/6-x)=1/3,则cos(2pai/3+2x)=?