SubArea: Properties of functionsLevel: BProject ID: 2000002404Accepted: 0Clonable: 0Easy: 1Decide which of the functions is even.\( f(x) = -x^2 +3 \)\( f(x) = \frac{x}{x^2} \)\( f(x)=-2x^3 \)\( f(x) = \frac{1}{x^2+3x} \)
