>
数学
>
sin17度sin77度+cos17度cos77度=
人气：476 ℃ 时间：2020-06-02 15:25:09
解答
sin17度sin77度+cos17度cos77度
=cos(17-77)
=cos(-60°)
=1/2
推荐
cos77°cos17°+sin77°sin17°=
sin13°•cos17°+sin77°•sin17°=_．
sin17°cos13°+cos17°cos77°=
设a=√2/2(sin17度+cos17度),b=2cos^13度-1,c=√3/2,则
Cos17°和Sin17°等于多少?
有40克食盐溶液,若加入200克水,它的浓度就减少10％.这种溶液原来有多少克水?原来浓度是多少?
请问BEC高级的各题的分数比例是多少?每一部分各占多少分
古诗词中描写鱼的诗句,
猜你喜欢
There was a big river and tow hills in my hometown ten years ago.
诗经采薇表达了什么的思想感情
clothing made of the man-made fiber has certain advantages over() made of natural fiber like cotton
连续的两句含有"杜鹃"的古诗句.
若等差数列{an}的公差d≠0，且a1，a3，a7成等比数列，则a1a4=（ ） A.12 B.25 C.2 D.52
一元二次方程-已知关于x的方程x^2+px+q=0的两个根式-1和-3,求p和q的值
About twice a week my driver collects me from school.l go and have lunch with a client
十年树木百年树人的意思
© 2026 79432.Com All Rights Reserved.
电脑版
|
手机版
