化简sin(α-3/2π)cos(α-π)-sin(α-2π)cos(α-π/2)=?
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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(-π/2-α)sin(πα)cos(-α-π)/cos(π-α)sin(3π α)
(1+sinα+cosα)*[sin(α/2)-cos(α/2)]/√(2+2cosα)化简 (3/2*π
化简sin(α-5π)/cos(3π-α)×cos(π/2-α)/sin(α-3π)×cos(8π-α)/sin(-α-4π)
化简sin(α-2π)+sin(-a-3π)cos(α-3π)/cos(π-α)-cos(-π-α)cos(α-4π)
化简cos(3/2π+π)sin(-π+α)
化简sin(α-3/2π)cos(α-π)-sin(α-2π)cos(α-π/2)=?
化简:sin(2π-α)cos(π/2+α)+sin(3π/2-α)cos(π-α)=
利用和差角公式化简 (2)sin(π/3+α)+sin(π/3-α)(2)sin(π/3+α)+sin(π/3-α)(3)cos(π/4+α)-cos(π/4-α)(4)cos(60°+α)+cos(60°-α)(5)sin(α-β)cosβ+cos(α-β)sinβ(6)cos(α+β)cosβ+sin(α+β)sinβ
[sin(5π-α)cos(-π-α)]/[cos(α-π)cos(π/2+α)]化简
化简2sin[(π/2)+α]-cos(-π+α)/cos(3π+aα)
求值【sin(2π-α)sin(π+α)cos(-π-α)】/【sin(3π-α)-cos(π-α)】
化简:cos(2π-α)sin(-π-α)/sin(π/2+α)tan(3π-α)
化简sin(π/2+α)cos(3π-α)tan(π+α)/cos(π/2-α)cos(-α-π)
化简{sin(π+α)^3cos(-α)cos(π+α)}/{tan(π+α)^3cos(-π-α)^2}
化简:sinα-√3 cosα+2cos(α-π/3)
化简:2sinα^2cosα-sin(3/2π-α)cos2α=
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