若<img src="http://jgxm-question.oss-cn-beijing.aliyuncs.com/psst/files/ac97cde8a820431691da20d96e924b40.png?x-oss-process=image/sharpen,200"/>是<img src="http://jgxm-question.oss-cn-beijing.aliyuncs.com/psst/files/3af5e42c36b64ec0b77f12c6f0429852.png?x-oss-process=image/sharpen,200"/>上的偶函数，则<img src="http://jgxm-question.oss-cn-beijing.aliyuncs.com/psst/files/f362c125509247718e00ee6bb34afc75.png?x-oss-process=image/sharpen,200"/>