cos(a+b)=(根号6+根号2)/4,cosa=(根号6-根号2)/4,a,b∈[0,π/2],则sinb=,用sinb=sin(a+b-b)做并写过程那是第1题,这还有一题,注意这是2题都要回答才会被采纳设S扇=n,半径为r,圆心角所对的弧长为l,
来源:学生作业帮助网 编辑:作业帮 时间:2024/07/27 07:32:21
![cos(a+b)=(根号6+根号2)/4,cosa=(根号6-根号2)/4,a,b∈[0,π/2],则sinb=,用sinb=sin(a+b-b)做并写过程那是第1题,这还有一题,注意这是2题都要回答才会被采纳设S扇=n,半径为r,圆心角所对的弧长为l,](/uploads/image/z/2758657-49-7.jpg?t=cos%28a%2Bb%29%3D%28%E6%A0%B9%E5%8F%B76%2B%E6%A0%B9%E5%8F%B72%29%2F4%2Ccosa%3D%28%E6%A0%B9%E5%8F%B76-%E6%A0%B9%E5%8F%B72%29%2F4%2Ca%2Cb%E2%88%88%5B0%2C%CF%80%2F2%5D%2C%E5%88%99sinb%3D%2C%E7%94%A8sinb%3Dsin%EF%BC%88a%2Bb-b%EF%BC%89%E5%81%9A%E5%B9%B6%E5%86%99%E8%BF%87%E7%A8%8B%E9%82%A3%E6%98%AF%E7%AC%AC1%E9%A2%98%EF%BC%8C%E8%BF%99%E8%BF%98%E6%9C%89%E4%B8%80%E9%A2%98%EF%BC%8C%E6%B3%A8%E6%84%8F%E8%BF%99%E6%98%AF2%E9%A2%98%E9%83%BD%E8%A6%81%E5%9B%9E%E7%AD%94%E6%89%8D%E4%BC%9A%E8%A2%AB%E9%87%87%E7%BA%B3%E8%AE%BES%E6%89%87%3Dn%EF%BC%8C%E5%8D%8A%E5%BE%84%E4%B8%BAr%EF%BC%8C%E5%9C%86%E5%BF%83%E8%A7%92%E6%89%80%E5%AF%B9%E7%9A%84%E5%BC%A7%E9%95%BF%E4%B8%BAl%EF%BC%8C)
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来源:学生作业帮助网 编辑:作业帮 时间:2024/07/27 07:32:21