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a) f(x) =-4x
f(-x) = -4 * (-x) = 4x
-f(-x) = -4x
nieparzysta
b) f(x) = x³-2
f(-x) = (-x)³ - 2
(-x)³ zawsze bedzie ujemne
-f(-x) = (-1) * (-x)³ - 2 = x³-2
również nieparzysta.