设f（α）=2sinacosatana/1+sin

设f（α）=2sinacosatana/1+sin²a+cos（3π/2+a）-sin²（π/2+a

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设f(α)=[2sin(π+α)cos(π-α)-cos(π+α)]/[(1+sin^2α+sin(π-α)-cos^2
设f(α)=[2sin(π+α)cos(π-α)-cos(π+α)]/[(1+sin^2α+sin(π-α)-cos^2
已知f（α）=[cos（a-3π/2）*sin（7π/2+a）]/sin（-a-π）
1.化简f(a)={[sin(π-α)cos(2π-α)cot(3π+α)]/[cot(-π-α)sin(-π-α)]}
sin2α=sin^2(α+π/4)-cos^2(α+π/4)=2sin^2(a+π/4)-1=1-2cos^2(α+π
设f(A)=[2COS3次方A+sin方(2π-A)+sin(π/2+A)-3]/[2+2cos方(π+A)+cos(-
已知f(a)=sin(a-3π)cos(2π-a)sin(-a+3π/2)/cos（-π-a)sin(-π-a)
已知f（α）=sin(α−3π)•cos(π+α)cos(2π−α)•sin(−π−α)•sin(3π2−α)
已知f(α)＝sin(α−3π)•cos(2π−α)•sin(−α+3π2)cos(−π−α)•sin(−π−α)
已知1/2sin(α-π)=cos(α-2π),求sin（π-α）+5cos（2π-α)/3sin（3π/2+α-sin