Funciones pares e impares

Now Playing:Es even and odd functions– Example 1

Determina si la función $\, f(x)=7x^9+12 \,$ es par, impar o ninguna de las dos.
Determina si la función $\, f(x)=3x^7+4x^5-90x^2$ es par, impar o ninguna de las dos.
Determina si la función $\, y=4x^8+2x^4-7x^2$ es par, impar o ninguna de las dos.

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