设周期为4的奇函数f(x)的定义域为R,且当x∈[4,6)时,f(x)=2-x2,则f(-1)的

设周期为4的奇函数f(x)的定义域为R,且当x∈[4,6)时,f(x)=2-x2,则f(-1)的值为

___________________.

答案

23

解:由已知得f(-x)=-f(x),且f(x)=f(x+4),

∴f(-1)=-f(1)=-f(5)=-(2-52)=23.

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