化简sin(3π-α)/[sin(-α-2π)]+cos(4π-α)/[cos(α-5π)]+tan(-α)/[tan(π+α)]

化简sin(α+β)+sin(α-β)+2sinαsin(3π/2-β)= 化简：sin²α+sin²（α+π/3）+sin²（α-π/3） 化简sin(-π/2-α)sin(πα)cos(-α-π)/cos(π-α)sin(3π α) 化简:[sin(2004π-α)cos(α-2005π)/cot(2003π-α)sin(α+3π)]+sin(α-π) 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(π/3-α)如何等于sin(π/3+α) 化简sin(30+α)-sin(30-α) 2sin(α+π/3）=sinα+______ sin(kπ+α)化简 化简:(sinα-cosα)^2+sin4α/2cos2α 化简:sin^2x+sin^2(x+2π/3)+sin^2(x-2π/3) 化简 sin(π+α)+sin(2π+α)+sin(3π+α)+……+sin(kπ+α) k属于Z sin(α-3π)等于 化简sin(π/4+α)cosα-sin(π/4-α)sinα 化简sin^2(α-π/6)+sin^2(α+π/6)-sin^2α 已知sin(3π-α)=-2sin(π/2+α)则sinαcosα 求sin^2α+sin^2(π/3 +α)+sin^2(π/3 -α) 化简:cos(2π-α)sin(-π-α)/sin(π/2+α)tan(3π-α) 已知sinα=-0.4,求下列三角函数值 sin（-α） sin（3π-α） sin（α-π） sin（α-10π）