f(x)=x^2+1/x^4
f(-x)=(-x)^2+1/(-x)^4=x^2+1/x^4=f(x)
f(x)=f(-x)
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f(x)=x^2+1/x^4
f(-x)=(-x)^2+1/(-x)^4=x^2+1/x^4=f(x)
f(x)=f(-x)
Четная