f(-x) = (-x)⁴+2*(-x)² = x⁴+2x² = f(x) – чётная;
f(-x) = (-x)³/((-x)²+1) = -x³/(x²+1) = -f(x) – нечетная.
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f(-x) = (-x)⁴+2*(-x)² = x⁴+2x² = f(x) – чётная;
f(-x) = (-x)³/((-x)²+1) = -x³/(x²+1) = -f(x) – нечетная.