化简sin^2(α-π/6)+sin^2(α+π/6)-sin^2α
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化简sin(α+β)+sin(α-β)+2sinαsin(3π/2-β)=
化简sin^2(α-π/6)+sin^2(α+π/6)-sin^2α
求值sin^2(α-π/6)+sin^2(α+π/6)-sin^2α
化简sin^2α+sin^2β+2sinαsinβcos(α+β)
化简sin(α+β)-2sinαsinβ/2sinαsinβ+cos(α+β)
化简sin(-π/2-α)sin(πα)cos(-α-π)/cos(π-α)sin(3π α)
化简 {sin(π+α)cos(α-2π)tan9π/4}/sin(-α)sin(7π/2+α)过程
化简1-sin[α-2π]sin[π+α]-2sin²[-α].
化简sin²α-2sinαcosα+1
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)
化简:sin(-a)cos(2π+a)sin(-a-π)
2sin(α+π/3)=sinα+______
为什么sin(2π-α)=-sinα?
化简:(sinα-cosα)^2+sin4α/2cos2α 化简:sin^2x+sin^2(x+2π/3)+sin^2(x-2π/3)
sin^2(π/3-x)+sin^2(π/6+x)
化简 sin(π+α)+sin(2π+α)+sin(3π+α)+……+sin(kπ+α) k属于Z
化简sin(2π+a)
sin(α+β)-2sinαcosβ/2sinαsinβ+cos(α+β)化简