(sina/2-cosa/2)^2=(-根号5/5)^2
sina=4/5,tana<0
tana=-4/3
tan2a=2tana/(1-tan^2a)=24/7
tan(2a-π/4)
=(tan2a-tanπ/4)/(1+tan2a*tanπ/4)
=17/31
已知sina/2-cosa/2=-根号5/5,求tan(2a-π/4）
已知sina/2-cosa/2=-根号5/5,求tan(2a-π/4）
已知sina/2-cosa/2=-根号5/5,且450
已知sina/2-cosa/2=-根号5/5,且450
其他人气：780 ℃时间：2019-12-10 21:53:20
优质解答
我来回答
类似推荐
猜你喜欢
- 1用1体积水吸收212体积氯化氢,所得盐酸的密度是1.15g每立方厘米,计算盐酸溶液的质量分数和物质的量浓度
- 2She reached at the glass,but it had dropped
- 3弧度数为3的角是第几象限,
- 4Jet was surprised when he heard the surprising news .为什么第二个surprise要用ing形式
- 5用力敲响音叉,并用悬挂的乒乓球接触发声的音叉,我们看到的现象是（ ）,此现象说明（ ）；乒乓球的作用
- 6求西游记的摘抄加赏析1000字 急
- 7there are cups of water on the desk.对cups of water 提问
- 8will you ()me my books when you come here tomorrow?
- 9Write the following words in Column A according to their explanation in Column B
- 10碱式碳酸铜加热分解在什么情况下会生成氧化亚铜