这个题目的关键在于,函数是偶函数,x有两个值对应一个y值,因此解反函数时,不是一一对应的关系,所以就限制-1≤x
Y=1-根号（1-x^2） 1-x^2=(1-y)^2 x^2=1-(1-y)^2 x^2=2y-y^2 因为：-1≤x
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