cos15°-sin15°的值是多少?

cos15°-sin15°的值是多少? sin15°-cos15°/sin15°+cos15°的值? sin15°-cos15°/sin15°+cos15°的值? 求sin15°+cos15°的值 sin15°cos15°的值为 sin15°cos15°的值 求（sin15°-cos15°）/（sin15°+cos15°）的值 (sin15°+ cos15°)/(sin15°- cos15°）的值是 (sin15°+cos15°）（sin15°-cos15°）的值为? ㏒2sin15°+㏒2cos15°的值是多少? tan15°+cos15°/sin15°的值 求详解 求sin15°+tan30°cos15°的值 sin15°×COS15°的值要有过程 向量a=(cos15°,sin15°),b=(-sin15°,-cos15°),则|a-b|的值是 化简sin15°-cos15°/sin15°+cos15° (sin15°－cos15°)/(sin15°+cos15°)= 化简sin15°-cos15°/sin15°+cos15° sin15°cos15°等于