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設F(x)=f(x)*f(-x),則函數F(x)的定義域與f(x)的定義域相同. 因為F(-x)=f(-x)*f[-(-x)]=f(x)*f(-x)=F(x). 所以,F(x)是偶函數. 而F(x)=f(x)*f(-x). 所以,f(x)*f(-x)是偶函數.
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