化简:(2)cos(70°+α)sin(170°+α)-sin(70°+α)cos(10°+α)
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(sinα+cosα)^2化简
sin(α+β)-2sinαcosβ/2sinαsinβ+cos(α+β)化简
化简sin(α+β)-2sinαcosβ 除以 2sinαsinβ+cos(α+β)
化简(2sinα+cosα)²+(2cosα-sinα)²
求值:(tan10°-√3)×cos10°/sin50° 求证:[sin(2α+β)]/sinα- 2cos(α+β)=sinβ/cosα 化简cosθ+cos(θ+2π/3)+cos(θ+4π/3) 证明:sin(α+β)sin(α-β)=sin^2α-sin^2β
化简:(2)cos(70°+α)sin(170°+α)-sin(70°+α)cos(10°+α)
①sin(α+180°)cos(-α)sin(-α-180°)和②sin³(-α)cos(2π+α)tan(-α-π)化简
求证 1+sinα+cosα+2sinαcosα/求证 (1+sinα+cosα+2sinαcosα)/(1+sinα+cosα)=sinα+cosα
化简 根号2cosα-根号2sinα化简(1) 根号2cosα-根号2sinα(2)sinα+cosα
化简[sin(π/2-α)cos(π/2-α)]/cos(π+α)-[sin(π-α)cos(π/2-α)]/sin(π+α)
2sin²α-sinαcosα/sinαcosα+cos²α (tan=2)
已知sinα+3cosα=2,求(sinα-cosα)/(sinα+cosα)的值
已知sinα+3cosα=2,求(sinα-cosα)/(sinα+cosα)的值
化简(1-sinα+cosα/1-sinα-cosα )+(1-sinα-cosα/1-sinα+cosα)
化简:sin²(α+π)cos(-α+π)/tan(α+π)tan(α+2π)cos²(-α-π)1.cos(27°+α)cos(33°-α)-sin(27°+α)sin(33°-α) 2.sin²(α+π)cos(-α+π)/tan(α+π)tan(α+2π)cos²(-α-π)
求证:2(cosα-sinα)/(1+sinα+cosα) = cosα/(1+sinα)- sinα/(1+cosα)
证明2(cosα-sinα)/(1+sinα+cosα)=cosα/(1+sinα)-sinα/(1+cosα)
化简sin^4x-sin^2+cos^2化简(1)sin^4x-sin^2+cos^2(2)根号(1+cosα/1-cosα)+根号(1-cosα/1+cosα)(180°<α<270°)