‎设函数<img src="http://jgxm-question.oss-cn-beijing.aliyuncs.com/psst/files/f1c2b0b1c97c4975bb3a81e078e56cb9.png?x-oss-process=image/sharpen,200"/>，<img src="http://jgxm-question.oss-cn-beijing.aliyuncs.com/psst/files/f476253324234488a2853701507f34f4.png?x-oss-process=image/sharpen,200"/>，反函数<img src="http://jgxm-question.oss-cn-beijing.aliyuncs.com/psst/files/7811a0f6fb3843e7b7d21a92aca82d28.png?x-oss-process=image/sharpen,200"/>是（）‍