f(x) = x²sinx
f(-x) = (-x)²sin(-x) = x² * (-sinx) = -x²sinx = -f(x) - нечётная.
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f(x) = x²sinx
f(-x) = (-x)²sin(-x) = x² * (-sinx) = -x²sinx = -f(x) - нечётная.