admin百科知識 2022-02-13 18:49:48 已知sin(a+派)=-12則1cos(a+7派)的值爲已知sin(a 派)=-1/2則1/cos(a 7派)的值爲網友廻答:匿名網友sin(a π)=-1/2-sina=-1/2sina=1/2 cosa=√3/2 or -√3/21/(cos(a 7π)=1/(cos(a π)=-1/cosa=2√3/3 or -2√3/3【歡迎追問,謝謝採納!】網友廻答:匿名網友sin(a 派)=-1/2sina=1/2所以1/cos(a+7π)=-1/cosa=±2/√3 db標簽 生活常識_百科知識_各類知識大全»已知sin(a+派)=-12則1cos(a+7派)的值爲
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