If f(x)=x3−3xf(x) = x^3 - 3xf(x)=x3−3x, which of the following is true?
f(−x)=−f(x)f(-x) = -f(x)f(−x)=−f(x)
f(−x)=f(x)f(-x) = f(x)f(−x)=f(x)
fff is neither even nor odd
fff is injective on R\mathbb{R}R