(1)计算:
;
(2)计算:![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c88f857e54dabdda73628f751ca88bf.png)
(3)解方程:(2x+1)2+4(2x+1)+3=0
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81556a034d85044495d6ec7b9b3a0c45.png)
(2)计算:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c88f857e54dabdda73628f751ca88bf.png)
(3)解方程:(2x+1)2+4(2x+1)+3=0
更新时间:2016-12-06 12:25:55
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【知识点】 求特殊角的三角函数值解读