化简1+sin(α-2π)sin(π+α)-2cos(-α)
(1+sinα+cosα)*[sin(α/2)-cos(α/2)]/√(2+2cosα)化简 (3/2*π
化简sin²α-2sinαcosα+1
化简:(1)sin(α+β)−2sinαcosβ2sinαsinβ+cos(α+β)
化简:[1+2sin(α+2π)*cos(α-2π)]/[sin(α+4π)+cos(α+8π)]
化简 (1)、sin(α+180度)cos(-α)sin(-α-180度) (2)、sin3(-α)cos(2π+α)t
化简:根号下 (1-sinαsinβ)^2-(cosα)^2(cosβ)^2 -π/2
化简:1、sin(x-π/3)-cos(x+π/6)+√3cosx=?2、已知,sinα+sinβ=√2/2,求cosα
sinα=-2cosα,求sin^2α-3sinαcosα+1
化简[sin(π/2-α)cos(π/2-α)]/cos(π+α)-[sin(π-α)cos(π/2-α)]/sin(π
化简sin(α-5π)/cos(3π-α)×cos(π/2-α)/sin(α-3π)×cos(8π-α)/sin(-α-
已知 sinα+2cos(5π/2+α)/cos(π-α)-sin(π/2-α)=-1/4 求(sinα+cosα)平方
已知α∈(π,2π) sinα+cosα=1/5 求sinα*cosα sinα-cosα