化简(2cosα^2-1/cosα^2+tanα^2)/(2tan(π/4-α)sin(π/4+α)^2

cos^2α+cos^2(α+π/3)-cosαcos(α+π/3)化简 化简√cos²α-2cosα+1 【2cos³α-cos²α+cosα-2】/2cos²α+cosα+2化简 求和：cos(0)+cos(α)+cos(2α)+cos(3α)+……cos(nα) 化简cosαcosα/2cosα/2^2cosα/2^3……cosα/2^n-1 5cos^2α=1 cosα=? cos(α+β)cos(α-β)=1/3,则cos^2α+cos^2β=?cos(α+β)cos(α-β)=1/3,则cos^2α+cos^2β=? cos(α+β)cos(α-β)=1/3,则cos^2α+cos^2β=?cos(α+β)cos(α-β)=1/3,则cos^2α+cos^2β=? 2sinα*cosα*cos(2π-α)+cos(π+2α)*cosα*tanα化简! 化简:sin^2αcos^2β-cos^2αsin^2β+cos^2α-cos^2β具体步骤, 化简sin(α+β)-2cosαsinβ/2cosαcosβ-cos(α+β) sinα+cosα=1,求cos^2α+cos^6α+cos^8α的值. sin(α+β)-2cosαsinβ/2cosαcosβ-cos(α+β) 求和：cosα+cos(2α)+cos(3α)+……+cos(nα) [sin(5π-α)cos(-π-α)]/[cos(α-π)cos(π/2+α)]化简 化简:cosα+cos(2π/3-α)+cos(2π/3+α) 化简(sinα)^2tanα+cosα+(cosα)^2*1/tanα+2sinαcosα (1+sinα+cosα)*[sin(α/2)-cos(α/2)]/√(2+2cosα)化简 （3/2*π