一求下列各式的值(1.)tan34+tan26+根号tan34tan26(2.)sin50(1+根号3tan10)已知cos(x+y)=4/5,cos(x-y)=-4/5,且3/2π小于x+y小于2π,π/2小于x-y小于π,分别求cos2x和cos2y的值
来源:学生作业帮助网 编辑:作业帮 时间:2024/07/14 02:04:37
![一求下列各式的值(1.)tan34+tan26+根号tan34tan26(2.)sin50(1+根号3tan10)已知cos(x+y)=4/5,cos(x-y)=-4/5,且3/2π小于x+y小于2π,π/2小于x-y小于π,分别求cos2x和cos2y的值](/uploads/image/z/10156233-57-3.jpg?t=%E4%B8%80%E6%B1%82%E4%B8%8B%E5%88%97%E5%90%84%E5%BC%8F%E7%9A%84%E5%80%BC%EF%BC%881.%EF%BC%89tan34%2Btan26%2B%E6%A0%B9%E5%8F%B7tan34tan26%EF%BC%882.%EF%BC%89sin50%EF%BC%881%2B%E6%A0%B9%E5%8F%B73tan10%EF%BC%89%E5%B7%B2%E7%9F%A5cos%EF%BC%88x%2By%EF%BC%89%3D4%2F5%EF%BC%8Ccos%EF%BC%88x-y%EF%BC%89%3D-4%2F5%EF%BC%8C%E4%B8%943%2F2%CF%80%E5%B0%8F%E4%BA%8Ex%2By%E5%B0%8F%E4%BA%8E2%CF%80%EF%BC%8C%CF%80%2F2%E5%B0%8F%E4%BA%8Ex-y%E5%B0%8F%E4%BA%8E%CF%80%EF%BC%8C%E5%88%86%E5%88%AB%E6%B1%82cos2x%E5%92%8Ccos2y%E7%9A%84%E5%80%BC)
xݒJ@_cbH7I/"x҆V)1bKU
Eы'/UƲxB69LR xdaݘv=<q_Q<'ܣNMP`e5%z|*( RsҬjiCNRb?<:`v(A %%5BF'l(\^}!,7@]x!Ld]1I'^