和角公式
【自主学习】
1、![](https://wkrtcs.bdimg.com/rtcs/image?w=88&md5sum=365fecda7e3567681a2f8f1e8410383f&sign=373d187a2c&rtcs_flag=1&rtcs_ver=3&l=webapp&bucketNum=99&ipr={"t":"img","w":"88","h":"21","dataType":"gif","c":"word/media/image1.png"})
![](https://wkrtcs.bdimg.com/rtcs/image?w=87&md5sum=365fecda7e3567681a2f8f1e8410383f&sign=373d187a2c&rtcs_flag=1&rtcs_ver=3&l=webapp&bucketNum=99&ipr={"t":"img","w":"87","h":"21","dataType":"gif","c":"word/media/image2.png"})
2、![](https://wkrtcs.bdimg.com/rtcs/image?w=85&md5sum=365fecda7e3567681a2f8f1e8410383f&sign=373d187a2c&rtcs_flag=1&rtcs_ver=3&l=webapp&bucketNum=99&ipr={"t":"img","w":"85","h":"21","dataType":"gif","c":"word/media/image3.png"})
![](https://wkrtcs.bdimg.com/rtcs/image?w=84&md5sum=365fecda7e3567681a2f8f1e8410383f&sign=373d187a2c&rtcs_flag=1&rtcs_ver=3&l=webapp&bucketNum=99&ipr={"t":"img","w":"84","h":"21","dataType":"gif","c":"word/media/image4.png"})
=
3、![](https://wkrtcs.bdimg.com/rtcs/image?w=273&md5sum=365fecda7e3567681a2f8f1e8410383f&sign=373d187a2c&rtcs_flag=1&rtcs_ver=3&l=webapp&bucketNum=99&ipr={"t":"img","w":"273","h":"45","dataType":"gif","c":"word/media/image5.png"})
![](https://wkrtcs.bdimg.com/rtcs/image?w=313&md5sum=365fecda7e3567681a2f8f1e8410383f&sign=373d187a2c&rtcs_flag=1&rtcs_ver=3&l=webapp&bucketNum=99&ipr={"t":"img","w":"313","h":"45","dataType":"gif","c":"word/media/image6.png"})
变形：![](https://wkrtcs.bdimg.com/rtcs/image?w=100&md5sum=365fecda7e3567681a2f8f1e8410383f&sign=373d187a2c&rtcs_flag=1&rtcs_ver=3&l=webapp&bucketNum=99&ipr={"t":"img","w":"100","h":"21","dataType":"gif","c":"word/media/image7.png"})
![](https://wkrtcs.bdimg.com/rtcs/image?w=100&md5sum=365fecda7e3567681a2f8f1e8410383f&sign=373d187a2c&rtcs_flag=1&rtcs_ver=3&l=webapp&bucketNum=99&ipr={"t":"img","w":"100","h":"21","dataType":"gif","c":"word/media/image8.png"})
【自我检测】
1．若![](https://wkrtcs.bdimg.com/rtcs/image?w=96&md5sum=365fecda7e3567681a2f8f1e8410383f&sign=373d187a2c&rtcs_flag=1&rtcs_ver=3&l=webapp&bucketNum=99&ipr={"t":"img","w":"96","h":"41","dataType":"png","c":"word/media/image9_1.png","imgOriW":2014,"imgOriH":867})
是第三象限的角，则=
A．![](https://wkrtcs.bdimg.com/rtcs/image?w=47&md5sum=365fecda7e3567681a2f8f1e8410383f&sign=373d187a2c&rtcs_flag=1&rtcs_ver=3&l=webapp&bucketNum=99&ipr={"t":"img","w":"47","h":"45","dataType":"png","c":"word/media/image11_1.png","imgOriW":1120,"imgOriH":1088})
B． C． D．
2．在![](https://wkrtcs.bdimg.com/rtcs/image?w=45&md5sum=365fecda7e3567681a2f8f1e8410383f&sign=373d187a2c&rtcs_flag=1&rtcs_ver=3&l=webapp&bucketNum=99&ipr={"t":"img","w":"45","h":"19","dataType":"gif","c":"word/media/image15.png"})
中，已知，则一定为
A．等腰三角形 B．直角三角形 C．钝角三角形 D．正三角形
3. 函数![](https://wkrtcs.bdimg.com/rtcs/image?w=128&md5sum=365fecda7e3567681a2f8f1e8410383f&sign=373d187a2c&rtcs_flag=1&rtcs_ver=3&l=webapp&bucketNum=99&ipr={"t":"img","w":"128","h":"21","dataType":"gif","c":"word/media/image17.png"})
的最大值为
A．1 B．![](https://wkrtcs.bdimg.com/rtcs/image?w=25&md5sum=365fecda7e3567681a2f8f1e8410383f&sign=373d187a2c&rtcs_flag=1&rtcs_ver=3&l=webapp&bucketNum=99&ipr={"t":"img","w":"25","h":"23","dataType":"gif","c":"word/media/image18.png"})
C． D．2
4、已知锐角![](https://wkrtcs.bdimg.com/rtcs/image?w=16&md5sum=365fecda7e3567681a2f8f1e8410383f&sign=373d187a2c&rtcs_flag=1&rtcs_ver=3&l=webapp&bucketNum=99&ipr={"t":"img","w":"16","h":"15","dataType":"gif","c":"word/media/image20.png"})
、满足，，则
A．![](https://wkrtcs.bdimg.com/rtcs/image?w=57&md5sum=365fecda7e3567681a2f8f1e8410383f&sign=373d187a2c&rtcs_flag=1&rtcs_ver=3&l=webapp&bucketNum=99&ipr={"t":"img","w":"57","h":"41","dataType":"gif","c":"word/media/image25.png"})
B. C. D.
5.已知![](https://wkrtcs.bdimg.com/rtcs/image?w=314&md5sum=365fecda7e3567681a2f8f1e8410383f&sign=373d187a2c&rtcs_flag=1&rtcs_ver=3&l=webapp&bucketNum=99&ipr={"t":"img","w":"314","h":"21","dataType":"gif","c":"word/media/image29.png"})
求的值. w
【合作探究】
1、 已知![](https://wkrtcs.bdimg.com/rtcs/image?w=79&md5sum=365fecda7e3567681a2f8f1e8410383f&sign=373d187a2c&rtcs_flag=1&rtcs_ver=3&l=webapp&bucketNum=99&ipr={"t":"img","w":"79","h":"21","dataType":"gif","c":"word/media/image31.png"})
是方程的两根，且，
求![](https://wkrtcs.bdimg.com/rtcs/image?w=43&md5sum=365fecda7e3567681a2f8f1e8410383f&sign=373d187a2c&rtcs_flag=1&rtcs_ver=3&l=webapp&bucketNum=99&ipr={"t":"img","w":"43","h":"21","dataType":"gif","c":"word/media/image34.png"})
的值
2、已知![](https://wkrtcs.bdimg.com/rtcs/image?w=175&md5sum=365fecda7e3567681a2f8f1e8410383f&sign=373d187a2c&rtcs_flag=1&rtcs_ver=3&l=webapp&bucketNum=99&ipr={"t":"img","w":"175","h":"39","dataType":"gif","c":"word/media/image35.png"})
且求．
【收获总结】1、公式的正用和逆用
2、角的拆分
【达标检测】
1、化简![](https://wkrtcs.bdimg.com/rtcs/image?w=112&md5sum=365fecda7e3567681a2f8f1e8410383f&sign=373d187a2c&rtcs_flag=1&rtcs_ver=3&l=webapp&bucketNum=99&ipr={"t":"img","w":"112","h":"41","dataType":"gif","c":"word/media/image38.png"})
．.
2、已知![](https://wkrtcs.bdimg.com/rtcs/image?w=296&md5sum=365fecda7e3567681a2f8f1e8410383f&sign=373d187a2c&rtcs_flag=1&rtcs_ver=3&l=webapp&bucketNum=99&ipr={"t":"img","w":"296","h":"41","dataType":"png","c":"word/media/image39_1.png","imgOriW":3675,"imgOriH":513})
= .
3、设![](https://wkrtcs.bdimg.com/rtcs/image?w=300&md5sum=365fecda7e3567681a2f8f1e8410383f&sign=373d187a2c&rtcs_flag=1&rtcs_ver=3&l=webapp&bucketNum=99&ipr={"t":"img","w":"300","h":"41","dataType":"gif","c":"word/media/image40.png"})
的值是（ ）
A．![](https://wkrtcs.bdimg.com/rtcs/image?w=21&md5sum=365fecda7e3567681a2f8f1e8410383f&sign=373d187a2c&rtcs_flag=1&rtcs_ver=3&l=webapp&bucketNum=99&ipr={"t":"img","w":"21","h":"41","dataType":"gif","c":"word/media/image41.png"})
B． C． D．
4、设cos＝-，tan＝,＜＜, 0＜＜求－的值
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