admin百科知識 2022-02-13 18:27:19 已知sin(π+α)=-12,計算(1)sin(π2+α)(2)cos(α-3π2)(3)tan(π2-α)已知sin(π α)=-1/2,計算(1)sin(π/2 α)(2)cos(α-3π/2)(3)tan(π/2-α)網友廻答:匿名網友sin(π α)=-1/2,sin(π/2 α)=sin(π α-π/2)=-cos(π α)=±√3/2;cos(α-3π/2)=cos(α-3π/2 2π)=cos(α π/2)=cos(α π-π/2)=sin(π α)=-1/2tan(π/2-α)=-tan(α-π/2)=-tan(α π-π/2... db標簽 生活常識_百科知識_各類知識大全»已知sin(π+α)=-12,計算(1)sin(π2+α)(2)cos(α-3π2)(3)tan(π2-α)
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