admin百科知識 2022-02-12 19:49:38 cos(α-β/2)=-1/9,sin(α/2-β)=2/3,且π/2<α<π,0<β<π/2,求cos(α+β)的值cos(α-β/2)=-1/9,sin(α/2-β)=2/3,且π/2<α<π,0<β<π/2,求cos(α+β)的值網友廻答:匿名網友cos(α-β/2)=-1/9π/4 db標簽 生活常識_百科知識_各類知識大全»cos(α-β/2)=-1/9,sin(α/2-β)=2/3,且π/2<α<π,0<β<π/2,求cos(α+β)的值
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