admin百科知識 2022-02-13 19:11:28 已知兀2已知兀/2網友廻答:匿名網友sin(a-b)=sin(a)cos(b)-sin(b)cos(a);故sin(a-b) 3/5=-2sin(b)cos(a) sin(a)cos(b)-sin(b)cos(a) 3/5=-2sin(b)cos(a); 將右麪的移到左邊,得 sin(a)cos(b)-sin(b)cos(a) 3/5 2sin(b)cos(a)=0;化簡的sin(a)cos(b) s... db標簽 生活常識_百科知識_各類知識大全»已知兀2
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