解:当x∈[-2,2]时,函数f(x)=-x²+1=-[(x-2)+2]²+1∵图像关于x=2对称∴当x∈[2,6]时,函数f(x)=-[-(x-2)+2]²+1=-(4-x)²+1∵f(x)为偶函数∴当x∈[-6,-2]时,函数f(x)=-[4-(-x)]²+1=-(4+x)²+1