求sin18度-根号3cos18度/sin42度的值
人气：218 ℃ 时间：2020-06-21 17:55:07
解答
sin18度-根号3cos18度/sin42
=1/2(cos60°sin18°-sin60°cos18°）/sin42°
=1/2sin（18°-60°）/sin42d°
=-1/2
推荐
- sin18度=（根号5-1）/4 则sin 702度?
- 根号18-(根号二-根号1)^0-2sin45度-(四分之一)^-1
- 已知点M（根号下2,-根号下3）,N（-根号下3,根号下2),则直线MN的倾斜角为多少度?
- 如图1,在三角形ABC中,角A=45度,AC=根号2,AB=根号3+1,BC=?
- 在三角形ABC中,已知a=2倍根号3,c=根号6+根号2,B=60度,求b和A
- All I could hear were the sounds of bombs exploding,crippling those people in their in their way.
- 化学问题~（关于沉淀符号）
- 急需祝福词语,帮帮忙吧~~~
猜你喜欢
- (三分之44-十分之33）除以五分之11等于多少
- They do not know the answer()this question.(填介词）
- If it___rain tomorrow,we___to the park.A.don't,go B.don't,will go C.doesn't,go D.doesn't,will go
- 电磁波是怎样产生的?
- 标准情况下,称量一个充满氯气的容器质量为74.6克,若改为氮气,质量为66克,容器的容积为?
- 有关保护植物的短文,要100字左右.至少5篇,最多5篇
- First,Please welcome to today's little English teacher这句话对吗?
- please tell him about it when she ____tomorrow.为什么不用将来时will come,而用comes
