若sin2α=（根号2）/2,则sin^4α+cos^4α=?
人气：137 ℃ 时间：2019-12-22 18:52:47
解答
sin2α=（根号2）/2
sin^4α+cos^4α=(sin^2a+cos^2a)^2-2sin^2acos^2a=1-1/2 sin^2(2a)= 1 - 1/2*(√2/2)^2 = 3/4
推荐
- 如果sinα+cosα=根号2,则sin2α=
- 若sinα-cosα=根号3/2,则sin2α=
- 已知sinα=﹣2根号2／3,sin2α＜0,则cosα=?
- 若sin2α=sinα+cosα,则根号2*sin(α+π/4)等于多少
- sinα+cosα=根号2/2,(90°
- 改错题：Accustomed to getting up early,the new schedule was not difficult for him to adjudt to.
- some,on,in,places,can,people,walk,fire 重新排列单词,组成句子
- (X+2)(X-4)=0 用因式分解法解一元二次方程
猜你喜欢
