解题方法
1 . ①已知
,则
是
的充分不必要条件;②函数
的定义域为
且
;③
是奇函数;④半径为2的圆中
圆心角所对的扇形面积为
,以上命题中正确的命题个数是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4e37c35e33ffa1a55a0693ae2319da91.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c6455e38ff53ede2508e4d9cb23f0b86.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccb4fa5edbb2a6b0c4bd1d997a0cf302.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fed85fbf141acae1df4e254c93c73026.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8f0cc728415e40da157463dffab0669.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ce315f9328065e07e42ca09deb55cdb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/086b0b3559d097eafe79c52b68e8c7c3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d5bca00fa20e6e80480b9d06d2e52ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac1a63ab608517bb10aa036783dfb51f.png)
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