已知锐角x满足条件:tanx=0.7410,那么锐角x约为[ ]A、36°32′B、53°28 ′C、45°12′D、86°30′
题型:期末题难度:来源:
已知锐角x满足条件:tanx=0.7410,那么锐角x约为 |
[ ] |
A、36°32′ B、53°28 ′ C、45°12′ D、86°30′ |
答案
A |
举一反三
如图,△ABC中,∠C=90°,BC=3,AC=4,则cosB= |
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104004239-44786.gif) |
[ ] |
A.![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104004239-57903.gif) B.![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104004239-14426.gif) C.![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104004239-38415.gif) D.以上答案都错 |
直角三角形ABC中, C= , A=2 B,则cosA等于 |
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A.![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104004234-17339.gif) B.![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104004234-84632.gif) C.![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104004235-79543.gif) D.![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104004235-53750.gif) |
如图,以直角坐标系的原点O为圆心,以1为半径作圆,若P是该圆上第一象限内的一点,且OP与x轴正方向的夹角为α,则点P的坐标是 |
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104004231-44569.gif) |
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A、(cosα,sinα) B、(sinα, cosα) C、(1, cosα) D、(1,sinα) |
如图,四边形ABCD中,∠A= 60。,∠B=∠D= 90。,AB =4,CD=2,则BC=( ) |
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104004228-58036.gif) |
在△ABC中,∠C=90°,AC=2,BC=3,则tanA=( ) |
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