已知α是第三象限角，sinα=﹣ 13 ，则cotα=_刷题宝

题干

已知α是第三象限角，sinα=﹣

1

3

，则cotα=（）

A： $\frac{\sqrt{2}}{4}$

B：﹣2 $\sqrt{2}$

C：﹣ $\frac{\sqrt{2}}{4}$

D：2 $\sqrt{2}$

上一题下一题 0.0难度选择题更新时间:2019-05-29 05:43:08

答案(点此获取答案解析）

D

同类题1

完形填空

Do you like playing the piano?Now there is a 1 in Sydney called“Play Me，I’m Yours”．People can 2the piano in many places for free．In addition to(除……之外)letting people enjoy beautiful music，the programme 3 helps them communicate(交流)with each other．

People have placed thirty pianos in 4parts of the city．People can 5 the words“Play Me，I’m Yours”on each piano．People can play music6 sing songs with the pianos．Many people stop to 7 or play happily．

Now lots of people are 8 in front of computers and busy with their work all day and they have no time to enjoy 9 ．So the programme is to help them relax and make 10 friends．

同类题2

若冬季冷锋快速南下，则我国大部分地区常出现的一种灾害性天气是

同类题3

如图，线段AB是⊙O的直径，弦CD丄AB，∠CAB=20°，则∠AOD等于（　　）

同类题4

作家罗曼·罗兰说：“人生不售来回票，一旦动身，绝不能复返。”这形象地说明（）

同类题5

爸妈让我做的事我认为不对时，应该（）

小学学科试题库

初中学科试题库

高中学科试题库