解题方法
1 . 下列说法:
①扇形的周长为
,面积为
,则扇形的圆心角弧度数为
;
②函数
的最大值为
;
③若
是第三象限角,则
的值为0或-2;
④若
,则
与
的终边相同;
其中正确的是_________ .(写出所有正确答案)
①扇形的周长为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80b1fe1b971b780e443a9b13621611c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38309217f0970107f6f6e65a4c77bae6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a9521abf0ff814208c82cc6d3bf03acb.png)
②函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cddeec2aca19a8f9b9f19c2aca44cdd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf298f00799cbf34b4db26f5f63af92f.png)
③若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5e7d8ca64211001b9b1e3630695e6ed4.png)
④若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7fc597b4887651e79f55670147a8d36b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b5858ee1ce52b251816757257a11c29.png)
其中正确的是
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