sin(a+β)cosα-cos(a+β)sina=√3/3
sin[(a+β)-a]=sinβ=√3/3
cos2β=1-2(sinβ)^2=1-2/3=1/3
已知sin(a+β)-cos(a+β)sina=根号3/3,cos2β=?
已知sin(a+β)-cos(a+β)sina=根号3/3,cos2β=?
数学人气:868 ℃时间:2020-06-22 10:55:58
优质解答
我来回答
类似推荐
猜你喜欢
- 1我们都知道努力工作的重要性.用英语怎么说 初三上英语
- 2I thought you were proud of the work I do.
- 3如图,在正方形ABCD中,点E、F分别在边BC,CD上,如果AE=4,EF=3,AF=5,那么正方形ABCD的面积等于( ) A.22516 B.25615 C.25617 D.28916
- 4某中学有500名毕业生参加中考,为了考察他们的数学成绩,教导处随机抽取了100名考生进行统计分析,则总体的一个样本是_.
- 5请各位帮忙解决一道数学题(一元二次方程)
- 6已知集合A={xl1≤x≤2},B={xl1≤x≤a,a≥1}.{1}若A真包含于B,求a的取值范围
- 7哪个单词由5个字母组成,去掉两个字母,剩下的却是一个"6"了
- 8用斜二测画法画出水平放置的一角为60°、边长为4cm的菱形的直观图.
- 9This part is to test your ability to do practical writing.You are required to write a notice accor
- 10U( ) he fell off his bike and hurt his leg.根据首字母填空