化简:(2cos^2α-1)/[2tan(π/4-

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化简(2cos²α-1)/[2tan(π/4-α)sin²(π/4+α)]
化简（1）sin(α+π)cos(-α)sin(-α-π) （2）sin³（-α）cos（2π+α）tan（-
化简 {sin(π+α)cos(α-2π)tan9π/4}/sin(-α)sin(7π/2+α)
[sin(2π+α）·tan(-α)·cos(-α)]÷[sin(-α)·cos(2π+α）·tan(2π+α）化简
化简cos(α -π )tan(α-2π)tan(2π-α)/sin(π+α)
化简（1）tan(π−α)cos(2π−α)sin(−α+3π2)cos(−α−π)sin(−π−α)．
化简cos(π-α)sin(α+2π)/cos^2(-α-π)tan(2π-α
化简：sin2(α+π)•cos(π+α)tan(π+α)•cos3(−α−π)•tan(−α−2π)．
化简2cos2α−12tan(π4−α)•sin2(π4+α)等于（　　）
化简2cos²α-1/2tan(π/4-α)cos²(π/4-α)