化简：{sin^2(α+π)*cos(α+π)*cos(-α-2π)}/{sin（-α-2π）*tan（π+α）*cos^3(-α-π）}这种次方不同的化简应该怎么做,是除以cos呢还是cos^2或cos^3?还是说有其他的别的方法?

化简:sin(2π-α)cos(π+α)cos(11π/2-α)/cos(π-α)sin(3π-α)sin(-π-α)sin(9π/2+α) [sin(5π-α)cos(-π-α)]/[cos(α-π)cos(π/2+α)]化简 (1+sinα+cosα)*[sin(α/2)-cos(α/2)]/√(2+2cosα)化简 （3/2*π 化简sin(-π/2-α)sin(πα)cos(-α-π)/cos(π-α)sin(3π α) 2sinα*cosα*cos(2π-α)+cos(π+2α)*cosα*tanα化简! 化简[sin(π/2-α）cos(π/2-α)]/cos(π+α)-[sin(π-α)cos(π/2-α)]/sin(π+α) 化简sin(α-5π)/cos(3π-α)×cos(π/2-α)/sin(α-3π)×cos(8π-α)/sin(-α-4π) 化简：(sin²αtanα+cos²α/tanα+2sinαcosα)sinαcosα 化简sin(α-2π)+sin(-a-3π)cos(α-3π)/cos(π-α)-cos(-π-α)cos(α-4π) 化简sin²α-2sinαcosα+1 （sinα+cosα）^2化简 若cosα>sinα,(-π/2 化简(sinα+cosβ)^2 化简sin(α+β)-2cosαsinβ/2cosαcosβ-cos(α+β) 化简:sin^2αcos^2β-cos^2αsin^2β+cos^2α-cos^2β具体步骤, 化简sin^2α+sin^2β+2sinαsinβcos(α+β) sin（α+β）-2sinαcosβ/2sinαsinβ+cos（α+β）化简 化简：sin(α+β)-2sinαcosβ/2sinαsinβ+cos(α+β)