‌设函数<img src="http://jgxm-question.oss-cn-beijing.aliyuncs.com/psst/files/4548602d01444224b31c69133d6dcf79.png?x-oss-process=image/sharpen,200"/>在<img src="http://jgxm-question.oss-cn-beijing.aliyuncs.com/psst/files/cd1c20b969fd491788e98ed01aed660c.png?x-oss-process=image/sharpen,200"/>上可导且<img src="http://jgxm-question.oss-cn-beijing.aliyuncs.com/psst/files/2c19a6071d78452c98379a2972e19c3e.png?x-oss-process=image/sharpen,200"/>，<img src="http://jgxm-question.oss-cn-beijing.aliyuncs.com/psst/files/787eaf61b7194646aa5f208ba8fdbd4e.png?x-oss-process=image/sharpen,200"/>是<img src="http://jgxm-question.oss-cn-beijing.aliyuncs.com/psst/files/4548602d01444224b31c69133d6dcf79.png?x-oss-process=image/sharpen,200"/>的反函数，且<img src="http://jgxm-question.oss-cn-beijing.aliyuncs.com/psst/files/8d107d8fd7e14820a99d4dd9ee96538b.png?x-oss-process=image/sharpen,200"/>，则<img src="http://jgxm-question.oss-cn-beijing.aliyuncs.com/psst/files/4548602d01444224b31c69133d6dcf79.png?x-oss-process=image/sharpen,200"/>等于（）. ‏